I wouldn’t say that 100% of the Republican party is evil.
On the voter level, there is certainly the “deplorable” faction whose support of Donald Trump is rooted primarily in their hatred of the “other”, or their own greed. But I suspect that most of them are decent people who have been lied to throughout their whole lives to the point that their identity is tied in with preserving those lies.
At the level of elected official however, with a few possible exceptions (Gohmert for example) most of them have the intellectual capacity to see through the lies. But here again we mostly divide into two categories. Those who truly are evil, and doing all they can to subvert Democracy, and hold onto power whatever the cost (for example McConnel, Nunes, and anyone directly involved in the Trump administration), but I think that most of the rest are simply cowards. They don’t necessarily like what Trump is doing or how the party has changed, but they are unwilling to sacrifice their careers making a stand that will just see them replaced by someone who more closely resembles Trump.