Kinda' crazy, but at the same time... kinda' not. You see pretty much the exact same reaction on a smaller scale when a skilled or lucky fraudster sinks their hooks into someone or part of a community. Compromised folks abnormally trusting even as they're fleeced for all they're worth (for all sorts of reasons, and often reinforced by a need to not acknowledge themselves as victimized or having been helping someone abuse people, among other things.), everyone else having a significantly easier time seeing what the hell is going on and even more distrusting of everything the con does (because it's been proven that said con's angle is pretty much never to anyone else's benefit, which makes it a hell of a lot easier to see bullshit for bullshit). And the latter often gets worse as time progresses, as the con only rarely can keep from continuing to piss on everything they touch. Pretty sure there's specialized psych/soc terminology surrounding the phenomena (it's fairly common with abuse victims, which conned people generally are, if to an arguably lesser degree than the more standard conceptualizations of the label), but hell if I can remember any of it at midnight through the haze of a grotesque stupidity induced headache.
It's not impossible for the victimized group to eventually realize what's been done to them, but... it can take a while, and it requires a degree of desire to see what's happening to and around them. And, well. The republican folk largely don't want to, quite yet. Unfortunately for the rest of us in particular, it's probably going to take shit starting to fall down around them pretty hard before the process involved there starts to happen.