Those that would enforce their own morality on another human being are wracked with guilt over their own 'feeling good'. The Bible, among other sources, gives people ALL the answers. All answers, IE feeling good, that are not found in there provide feelings of guilt for those closed minds that cannot find peace within.
This guilt comes from a very constipated spirituality, a very toxic spirituality. So assholes with this spiritual poison have to force their poison on others, they find it impossible NOT to interfere in someone else's life because there is so little going on in their own mind. They are moral degenerates without one of life's most important attributes . . . happiness. Since they find it impossible to be happy, no one else is allowed either. They take your bat and ball home and lock it up because denying you gives them pleasure in a very sick masochistic way, the same way that children bully other children that are smaller than themselves. They never outgrow this small mindedness.
So, if you have a small mind, a small penis and a huge ego, you go into politics and try to ruin the lives of many more people than yourself.
There are probably many more sociopathic and psychotic reasons. They didn't get enough love and attention as a child. They were bottle fed instead of breast fed. What ever it is, it gives them a psychosis called a superiority complex wherein their morality is superior to your morality. They're delusional really, living in a fantasy of horror that they feel the need to push the rest of us into. They're sick bastards.