A lot of these examples are distinct from Roko's idea, in that they are self-reinforcing, but generally through other mechanisms than distinguishing supporters from non-supporters and targeting those groups specifically.
There's a pretty strong governance norm (and in many cases constitutional protection) against this kind of segregation and targeting, at least in nominally-free democratic societies. A politician who puts opponents in jail JUST because they are opposed (or proposes a law that punishes ONLY those who oppose it) won't last long in most civil societies. In fact, the ability to do stuff like this is a pretty strong indicator that civility is a sham in that area.
This, of course, doesn't apply to a hypothetical all-powerful AI, as it doesn't really care about democratic support or what its' subjects think.