"Give a boy a Gun" Reading Skills

In my book Give a Boy a Gun, i'm really curious as to why Brendan's friends never stopped him from shooting some kids at school. He told his friends Allison and Gary, that he wanted to kill all of the people that bullied him basically. "We got up there, and he took this gun out of his pocket. Like, first we thought it was a toy, then Gary thought maybe a starter's pistol. Brendan said it was real, and I asked what he was going to do with it. I won't use the words he used, but basically he said he was going to blow away some kids at school" (Strasser 73). I don't understand why his friends wouldn't tell an adult or anyone about this, and want to know why they let it happen instead of trying to help him instead of just shrugging it off and thinking of it as a joke. One text to world connection i thought of while reading this book was that there are tons and tons of kids who have thought of suicide and murdering other people like Brendan did, and made me compare the reason that Brendan wanted to kill himself was cause he was bullied, and that is probably a lot of other kids reasons too. A text to text connection I thought of was this book I read called How I Survived Seventh Grade and it was about a girl who got made fun of a lot because she was nerdy and had big feet and stuff, and was sometimes depressed just like Brendan and Gary, and they reminded me of each other since they both got made fun of a lot.  A text to self connection I had was that I don't really connect with the main character Brendan because I have never gotten bullied like him, the only connection we have is when I was in fifth grade I dressed weird and got made fun of by this one kid, but besides that I never got made fun of and hope I never do, so I can't really relate to this book.