Well you could take that even deeper and ask what is a nice person. I am a nice person because there are to many people already why add to it.
if you are nice to someone they are nice in return i like when people are nice to me.
Well if everyone was a nice person then everyone else would be treated well, leading to greater amount of happiness in the world. You get what you give. Maybe.
im always a nice person. it makes me happy dunno. i think thats the way society works.wow, wait a minute. captcha? f* you man thats so annoying