Why?

Asking the "why"  question is useless.

Go there is you'd like. Go there if you need an excuse to rant. Go there if you need to feel righteous. Go there if you need to relive every injustice that you've been the brunt of. Go there if it helps you not feel helpless. Go there if you need an excuse to hate. Go there if you need an excuse to bring forth your pet peeve (gun control, no support for the mentally ill, abortion, etc.). Go there if it is part of your grieving process.

And when you are done, consider this.

When a tragedy hits an individual, family, or community, they (and things) are changed forever. They (and things) will never be the way "they used to be". They (and things) will never "get back to normal". They will never not have emotional pain.

The rules are now different. The rules are now, how do I find life in the midst of death? Initially it will be, is there life after death? and then it will become, if so, how do I find life in the midst of death?

"I set before you this day, life and death, choose life (and death) that you may live." Choose to live with death, with pain and while you are doing that, find life.