Trump Card As Ace Of Spades

This week we watched Sarah Palin endorse Donald Trump's candidacy for U.S. President and assert that her son's recent assault on her daughter-in-law and pointing an AR-15 at her head was the fault of Barack Obama (so much for the Conservative virtue of personal responsibility). Today we learned that Donald Trump has proudly announced that his supporters are so loyal they would stick with him even were he to murder somebody walking down New York's 5th Avenue. I would like an explanation from somebody still supporting him as to how and why they are able to still do that. Is it cognitive dissonance? Misanthropy? Nihilism?