Because they have a problem in the upper storey. But there is something important to remember - the abuser needs an abusee. Those who, as adults, allow themselves to be abused, also have problems. And if one abuser doesn't get them, probably another will. The abusee needs to resolve his or her problems so that this does not become a way of life. I am not absolving the abuser, but merely taking a realistic view of this terrible problem.
I agree with all the above...and more. There are a number of reasons.
Some do it because they are misguided in thinking they are actually doing good. Some are insensitive and don't realize the extent of the hurt done by what they are doing. Some are twisted and get pleasure from watching others suffer. Some do it to have that control/power over others. Some do it to get back at someone. Some do it because it was done to them and it is what they know to do. The list is long and many try to justify why they did it. It takes courage to admit it and seek ways to stop. We need to recognize it for what it is.
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I think it depends on what is happening in their lives , there are many forms of abuse ,and sometimes it is possible to stop the abuse, take back control from the person doing it, are you in this postion?
Because they are mean and controlling and by being that way they feel powerful. Sad isnt it.
You know, that is a really good question... and why do people use people... I am an outgoing and very giving friend to most and I keep getting **** on! Mental abuse is a nutshell... I believe the answer lies somewhere around the actual reality that they do not like themselves and are miserable... so they take steps to make anyone around them just as miserable as they are... no matter what it takes... inflicting pain is the goal.