The Republicans (I can't tapdance around the direct call out with weasel words) and the right-wing media have lost all credibility because they often DO behave as racist, selfish, inconsistent conspiracy theorists. On those rare occasions when they are right or properly play the role of opposition rather than pushing an absurd agenda alongside their media manipulation, their prior behavior causes an automatic immune-like response. You can't trust anything they say or their intentions, and they are experts at the Gish Gallop (constantly coming up with new bs you have to respond to, when response takes far more effort) - why would this particular action be any different? Also, this seems more of a case of "a broken clock is right twice a day" than an indication that the right should be taken seriously as a general rule.
Non-credible actors that are known to be untrustworthy should never be the people who put forth any hypotheses if you want them to be taken seriously. The American far-right politicians/media and 4chan are not credible actors, and any idea associated with them will face an uphill battle.
Partisanship is a disease that is destroying our democracy.
That's not an excuse, just what I think is a partial explanation.