I'm not convinced they really have any beliefs. The alt-right people I know don't give a crap about whether or not Trump actually does what he said he was going to do, or who he appoints to his cabinet. They just trust that everything he does is the correct thing to do in order to MAGA.
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This is what is baffling. How long have they not really had any beliefs? What, then, has kept them with the Republican Party?
In the early 2000s, the conservative message was heavy on patriotism, steadfast principles, Christian family values, and strong military. Fear drove the patriotism and push for military intervention.
We first saw a break in the message in 2004 with the swift boaters and conservatives attacking John Kerry's military service. Flip-flopping on issues was a major point of attack for Republicans.
In 2008, Republicans fall in love with brash Sarah Palin. Unconventional discourse entered high levels of politics.
In 2010, we see the rise of the Tea Party which touted fear-based uber-patriotism and purist, rigid principles. The "respect the POTUS" calls for GWB fly out the window as false, hateful rhetoric surrounding Obama become mainstream.
In 2012, Mitt Romney takes the party's nomination. More of a traditional candidate, he still is a Mormon. After the loss, the party's self-diagnosis shows constructive promise, but the hateful, fear-based rhetoric and obstructionism was an easier path following the power-swell that resulted from the 2010 gerrymandering.
By 2016, any sliver of the purist, rigid principles had disappeared. Republicans embraced the ultimate flip-flopping candidate with no record of holding family values or conservative principles. He is a former Democrat (gasp) who only sees the Christian tradition as a vehicle to promote himself. Prevalent throughout Donald Trump's message is a heavy dose of fear underlying every facet of his message.