How do/should accountablility, judgment, and forgiveness play in this in my life?
You have really good questions here. First I'd like to say I'm sorry for the hurt you've encountered in your young life. I know that what you went thru hurt Christ as much as it did you. It wasn't meant to be like this. I do know that things happen in our lives for a reason. We don't know sometimes until much later how God uses these things to be quite beneficial. I recommend your reading the story of Joesph in Gen 37-50. In the end we have that great statement from Joseph who said..."But as for you, you thought evil against me, but God meant it for good." Notice the years (12) he spent in prison for something he didn't do. If anyone should have been bitter it should have been Joseph.
God hates all sin. However it is his perogative to allow good to come out of the evil others devise. Joseph was taught to acknowledge and revere God's providence in his circumstances. We are to view God's hand not only in his goodness and mercy to us, but in our afflications and trials as well.
In Acts 2:23 it says "This man (Jesus) was handed over to you by God's set purpose and foreknowledge and you with the help of wicked men put him to death by nailing him on the cross." God knew it and allowed it.
There is both a direct will and permissive will in God's divine purpose. Men and women may be culpable and blameworthy for an act such as crucifying the Lord but as a permitted act it can still come under the total plan of God. If that is true for Chrit's crucifixtion then it is no less true in the case of Joseph and for us today as well.
As far as forgiveness we only have to look at him on the cross as our example. I just wrote about this on my blog. He said "father forgive them for they know not what they do." Stephen, before being stoned (Acts 7) said the same. It's so healing to forgive others that have wronged you. It's so freeing to just let it go. We, as humans tend to hold on, not letting it go, but as you probably know, it is not beneficial dragging us down, gnawing at us daily.
As far as judgment goes, we are not told "not to judge" but when we do to do so rightly. If you look at that verse you wrote above it clearly states that. Take the plank out of your eye before you take out the splinter in another's eye. We are not to make judgments hypocritically or with malice. Many times, we see Christ saying "You judged rightly." In order for Paul and Peter to so boldy come out against the authorities they had to make a judgment. They based it on the scriptures making a right judgment.
But having said that, you're right, there are too many quick to judge others and it can be easily found in many churches. We forget that we too are sinners saved by grace. Truth must be applied but not alone, mercy must be liberally applied as well. It says in scripture that mercy triumps judgment. We need to apply that to our lives when we judge one another or ourselves.