The party created this mess. By pandering to Tea Partiers and xenophobes more and more in recent years, they've welcomed the crazies into the party. Well, now the crazies dominate the base. What did you expect? I predicted this (albeit not with Trump as the candidate... nobody really predicted that) years ago when GOP officials kept increasingly giving in to and supporting Tea Partiers' unreasonable demands.
Yeah, but much of the Trump base is not tea partiers at all, who tend to be focused on fiscal issues and the like. It's more about the estranged working and lower middle class concerned about their standard of living and buying into Trump's protectionism, both as to trade, and as to immigration, with a loathing of Muslims mixed in.
That's cute that you think the Tea Party was ever motivated by "fiscal issues."