why say things and do things to other people

I don't know why, people to say things and do things, to make other people angry or sad I think that they do it cuz they don't feel good about themselves, they do because they are jealous of other people's lives the things that people have they wanted to take that away. Not anger is one step away from violence and sadness is one step away to anger and people like to be negative instead of positive one day the positivity is going to blow all that negativity away from you. And all that anger and sadness that you felt will turn the happiness as long as you're happy that's all that matters cuz they'll always be mad and hating.