Crossing the Parenting Line?

Every parent will “parent” their children a slightly different way from the next parent. What seems to be happening a lot is that parents are telling their children that they were mistakes, that the parents wish they never had said child(ren), and even kicking the child out. I can understand where some situations require for the child to leave. But this seems to just be out of sheer anger. Is this wrong? If you don’t think it is wrong, please explain why.