Hurting people

I hate hurting people. Mentally that is. Just seeing someone i have hurt can have me lying awake at night, guilty, for weeks on end.
Everybody says or does things without thinking, and i believe most people regret it afterwards, and feel the guilt.
So how do some people spend all their time insulting people, hurting people, killing people mentally? Why doesn't the guilt keep them awake all night? How do they live with themselves?
Maybe they honestly cannot see the problems they cause. Maybe these people are devoid of feelings, other than smug satisfaction that they have insulted someone 'unworthy' of being associated with in a friendly manner.
And then there are those people who are in more than friendly relationships and one day say "i never liked you anyway". That's just cruel. Dumping people at all is horrible to do, but if it has to be done, it can be done in a more sensitive way. There is no 'nice' way to dump or reject people, but you can try to show empathy.
I myself have hurt people before, and to them i am so sorry.
But to those people who hurt others based on things that make them unique and special, you are the scum of the earth. I hate you.

peace and happiness

xoxo