People tend to like easily digestible, one-dimensional solutions as they are easy to understand. These don't exist in reality, but are offered by conservatives so it is quite compelling.

Most conservatives I know, aren't there because of racism (a couple yes are like that) but more because they don't like that life and people fall on spectrums. They prefer it be black and white, yes or no, all or nothing. That's why they cling to the ideas of gender norms, absolute rights and wrongs, in groups and out groups, etc. And those that stand to win by dividing the populace are peddling to this desire for simple solutions to complex problems.

So when faced with real life and its consequences, it is more comfortable to keep believing it and just explain away the minor discrepancies (surely they will keep the good immigrants I know, my abortion would be a moral abortion, etc.)