why do some kids want other kids to go along with what they doing why is it hard for people to accept others who are different ?

i don t under stand why would go with some body that is doing some something that is bad for your life i think it is hard for some one to accept others of who they are that of someone that you don't feel good with or like feel weird , don't want to talk to maybe give them a Chance and maybe you would now some thing that you haven 't now about him/her or if you dont then just dont really talk with him/her...............other kids dont under stand what it means to do some thing that will destory them not just there self the people that love them , care