happy opt in

MP Seah Kian Peng suggested that those who earned $100k or more should be opt in to donate the $100 they are receiving from the GST rebate the govt is giving out. I supported this definitely. I agree with Seah Kian Peng that they are so happily rich that $100 really mean nothing to them but a lot to those who need them. And I am very sure that those being opted in will be more than happy to do so. This is a happy opt in, though it violated their right from having the choice to opt in/out. What the heck? Can we just opt people into anything just because it is insignificant to them or useful to others?