I understand that it is complicated. The US only takes about 1.2 million immigrants legally into the country every year, and because of our emphasis on family reunification, this means that startup founders may not get one of the spots.
If you make this about whether these folks should be allowed into the US, the answer (yes) is pretty simple, which is why some people think it is a simple question.
If you make this about whether a wealthy investor is now not only empowered not only to decide who gets money, but also who gets citizenship, it isn't nearly as obvious an answer. I would hope that people find the idea unsettling, no matter how high their regard is for the investors asking for this new power.