Lol. Every noticed how people like to laugh at other people getting hurt? Ever noticed how people like to bash and hate on others (celebrities mainly) whom they wouldn't even know? I could make a huge 列表 about everyday things that I'll bet everyone has done that could be considered harsh and irrational. But yeah, humans are cruel.
你 can't say that in general , it depends on , how were they brought up , cruel depends on how much did the human suffer and no one helped him 你 see the cruel humans ,cause their 爱情 for each other has disappeared and they look for their own matters ,they don't think about ,how can they damage others life
Albert Einstein 说 that "men have in them a need to hate and destroy" He was right. Most humans start out as cruel in there childhood. They either change as they grow older, 或者 they stay just as malicious.