In my opinion, I don't think so. I think to communicate or to build relationship with friends just like facing a mirror or among the mountains. What you do will reflect to you. If you smile at the mirror, you will see a smile face. If you say something good, you will be feedback with something good. vice versa.

how to say, i think it's a way to express some emotions. we couldn't promise we never do that, but just control ourselves. if there is terrible, maybe it can't be helped.but i believe humen is good at the begining.

yes...it's native words that mean bad things, so we get foreign euphanisms. but the world is not always peaches and sunshine and rainbows and young love and morning dew, bad shit exists, violence, anger, and everything that exists needs words to desribe it.