Trump is the only one they despise. Not DeSantis, not Rimrata Haley, not any of the others. They only hate Trump... therefore, he is the only one worth a damn.
Trump has so far proved an easy mark, so why should they let up. Rather than actually reduce the deep state, he augmented it with his appointments. Rather than rein them in, using his power as President, he let the DOJ run wild, and gain strength. Oh sure, he complains a lot, but seems incapable of actually ever taking any actions against them, for some reason.