If history and human nature is any guide, in the end those who will most viciously kick Trump in front of an oncoming train will be those who most fervently supported him in the past.
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They never cared about him then, and they don't care about him now. They are sociopaths who only ever cared about how they could use Trump to achieve their own ends, or cowards who will only stand on principle when it can bring them some advantage.