From a purely political (not ethical) standpoint, I understand why some of these Republicans are tolerating all the crazies from the Trump side. The Republican party is in sort of a nuclear war-type standoff, where mutually-assured destruction is the only thing keeping them together. Both traditional conservatives and the far right crazies know that without each other they both go down to the Democrats. Either side officially breaking off from the other would end in both being wiped off the map in most elections.