Well, it's in the term: justify, to show something is just. It has value assessment. Anyway, you're right, I'm not agreeing with what happened. But I also think that in general if we don't try to understand reasons, no matter how abhorrent we find them, how do we prevent such things from happening again?

I'm tired of seeing people being labeled as good or evil or whatever and that being used as the reasoning why someone behaved the way they did. We can understand situations, conditions and human psychology better than that and we should try to understand why horrible things happen. This applies to murder, abuse, any kind of violence, including the topic at hand. Only if we begin to understand the underlying reasons can we become proactive instead of reactive. I see it as a way to prevent further suffering and loss of lives, not a justification.

Anyway, if you find it emotionally too taxing, I can understand that. But I hope you can see that not everyone trying to understand the reasons is trying to justify it.