A delineation needs to be made.
'The GOP' is 'Leadership + Supporters'
The GOP leadership is a crooked band of swindlers, hustlers, hypocrites, and liars. They preach sexual morality while hosting orgies. They preach 'fair market' while choosing winners and propping up oligarchs. They preach 'state rights' while enacting onerous federal legislation.
The GOP supporters are, statistically poorly educated, highly religious, conditioned through purposefully targeted media to feel ostracized as a group, distrustful of education (as education contradicts religious dogma, and thus group identity, making it an existential threat), easily manipulated, and beholden to very simplified, authoritarian views of the world. They see abortion, and see baby murder, the end.
When you talk about 'the GOP', and mean party leadership, you should specify.
The latter is a toxic culture in the US, but is not purposefully toxic. They have been 'selectively bred' (ahem) to be that way, by the former, for more than 3 generations now. They simply want their idea of utopia. The reality that it is dystopic to ~50% of the public is ignored. They have been told they are oppressed, believe it, and are acting out. Just as the party leaders want them to.