And this is where we disagree. Most people do not want to know when it is absolutely necessary. They just look the other way and find out that they don't have to do anything. Plus they can scream at those who refused to look away.
I think you are correct on this- it's human nature, and also explains why car mechanics can easily fleece many customers for extra cash for problems that don't really exist.
At the end of the day, as a species we're largely uninterested in how things work or what's going on. Hence why voter turnout is generally very low. We all just want to have our little slice of life to live and expect that so long as we look after our part of the picture other people (leaders, scientists, diplomats, economists, civil engineers) will all look after their part of the picture diligently and society will hum along just fine.
This applies to pretty much everything. For example, I take for granted that I will have clean water that I can drink without getting sick, but yet when it comes to the intricacies of water treatment and transportation I'm a complete idiot. So for me to go to a townhall meeting and scream about the evils of a new pump station going in another part of town would be foolhardy as I really wouldn't know what I was talking about.
And so it goes with the general populace. We tend to leave the politicking to the politicians and when something like military intervention in a distant land comes up, many folks either
1) Don't want to know, or are mystified by the whole thing. "That's the governments call. If they say we need to go, I guess we gotta go. Pass the beer nuts, the game is starting soon"
2) Already have an opinion without the facts. These folks tend to be polarized by ideology and refuse to consider the situation on the ground, falling back to the position that sides with their beliefs regardless of the facts. ALL sides of the political spectrum are guilty of this sin. You have peaceniks that believe that all conflict of any type is inherently wrong and anyone who engages in it is guilty of crimes against humanity. You have environmentalists that believe that all hunting is wrong and hunters should be tried for capital punishment. On the flip side, you have folks that believe that most criminals should be punished with the death penalty or at the minimum stripped of all rights and thrown into gulag conditions to "teach them a lesson" and, yes, the much used evil corporate stereotype that sees only profit as the goal with no consideration for other human beings (Enron and the loss of life they caused in California would be one example)
3) Want to know more facts before making a decision. However, don't really want to take too much time out of their life so rely on mass media and 30 second sound bytes to explain the situation. This is most people I believe.
4) Want to know more facts but don't believe or trust a 30 second sound byte to adequately explain what's going on, and want to dig deeper. This is definitely the minority.
And of course, there's a blend of the above on some sort of scale. If I've missed one, please feel free to add!
As to your analogy, summarized in the last part-
The police did agree to send a social worker into Mr Moustache's house. Mr Moustache does not allow him to see every room and the social worker complains about that, but his final report said that he couldn't find any weapons bigger than legal hand guns. The police conclude that Mr Moustache is therefor not a threat. At the same time Mr Bernstein's youngest dies when one of Mr Moustache's hired thugs blows up the Bernstein's Volkswagen van. In that case, would I be justified to act?
This is a good analogy which sumarizes the case for invasion, and kudos to you for presenting it so well. In fact, I used to believe it. Remember, I originally was in favour of the Iraq war and believed this story wholeheartedly.
Is Mr. Moustache a bad man who needed to be dealt with? Absolutely.
But the story needs to be changed so that there are many men similar to Mr. Moustache who also abuse their families. But so long as they paid tribute to the mob they were left alone. The police, admittedly, are corrupt as they are controlled and largely vetoed by several large crime families who do business with many Mr. Moustache's across the city.
In this particular case was Mr Moustache abusing his family? Yes, undeniably. However, it should be noted that some of the members of his "family" he wasn't related to in any way and were forced to be part of his house by another gangster with a british accent many years ago.
It was this same gangster who also kicked down the door in concert with some other mobsters, namely the Don who was going to put an end to Mr Moustache's refusal to pay tribute accordingly.
Remember, across the street Mr Moustaches cousin (or very distant cousin) Mr. Bedouin has also been running around town blowing up people houses. In fact, some of the members of his house were responsible for blowing up some office buildings at the heart of the city, but since he's got extensive business dealings with the mob, they largely protect him from the police while making a relatively half-hearted attempt to get the people actually responsible for the act.
Now, I hope you're seeing where I'm going with this analogy which could be expanded on a great deal as could yours.
At the root, however, is a disagreement as to the nature of the situation and the particulars behind it.
Remember, the Iraq war was not sold to the American people on humanitarian grounds. If it was, the U.S and co would have to go and invade a lot of other countries, many of them allies, in order to set things right. It was sold on the fear of WMD's which ended up being nonexistent.