I don't know how it started but this definitely look like a raid from people exterior to the One Piece fanbase.
To a point, I can understand ONE their argument. Stayin silent under a democratic regim about the oppression done by the gov is really a sign of not caring at best. But here, we are talking about a dictature where a bad word can get you or your family arrested.
Aside from that, generalizing an ideology to an entire population (saying that all Russian think the same for example) is heavily problematic.
This is how authoritarian justify their atrocities. Those guys are angry and I can understand why, but they are going too far.