I have become a little disturbed in my head after i saw this video, any help?

I wanna do that to those guys that killed that poor innocent man, sorry child you had to see this. I just watched it and it is sad. Those guys should have got the same thing done to them s what happened to the man. It's sad what this world has come down to. God is real. Just think- how would we all be here, outer space, and everything. Not through evolution. Don't believe atheists, they just don't realize stuff. I'm thirteen also btw.