So you don't think that people will become less motivated to work if they know that at any time the rug can be pulled out beneath them?
The more you work, the more you get paid and the less affected you will be by this sort of thing, so I would assume this sort of risk motivated people to work harder.
When I directly answer why it wouldn't, you act as if I was supposed to be explaining addressing the ethics, and that my answer betrays me as callous and uncaring.
But you didn't make the argument that society should avoid "pulling the rug from under people" for its own sake, regardless of its affect on motivation to work. So I didn't address that point.
I did, however, explain precisely the ethics of my viewpoint in my original post, you just chose not to address this, and took the easy way out by focusing on a technical issue (the effect on people's motivation to work) and then pretending I had failed to address a moral issue that you raised.
It is a conditional system of reward. The equation is not equal for everyone.
Edit* Just found and article on the subject randomly
http://www.npr.org/blogs/ed/2014/08/07/335285098/rich-kid-po...