They are selfish
I guess we're conditioned by nurture, as well as environment and the experiences and interactions we have already had; plus peer pressure may factor in, in some cases. All people crave to be understood, to be accepted, to be loved; when others reject us, we feel that sting, we feel indignant and hurt about it.
ikr? annoying people :D
like what ?
Because we are all scum. According to christianity.
Have to act some way dont we?