I'm sick of saying this, but I'm going to again anyway, because it's important.
To blame Michael for what happened is not only useless, it's wrong.
Essentially, when doing that, we are reprimanding Michael for choosing to see the good in life rather then the bad. It is people's kill or be killed, survival mentality that makes the world such a hurtful and rotten place to live in. So when someone like Michael comes along, which isn't very often, who is willing to put himself in harms way and is willing to sacrifice his own safety and needs in order to hold on to his values and ideals, that should be admired and applauded, not criticized. It's people like Michael who makes this world a better place. Instead of allowing himself to become jaded and cynical, instead of allowing himself to be blinded by the conditioned surface of what society has forced something to become or by what society says a thing is, he looks well passed that and sees to a things core. He has a fundamental belief that even in the worst, there is real good.
The fault isn't in Michael's willingness to look for the good in people; it is in people's willingness to take advantage of his goodness for their own gain. The reason people become jaded is because if they try to be good, they get burned, just like Michael did. But Michael is a special person and just because he was betrayed, that didn't cause him to let go of his ideals and stop being kind, like most people do. He kept on and continues to because he's above that conditioning that the world puts on most people.
Again, that should be admired, not attacked.