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I understand their point. Yes, it's plain to see he hasn't 'drained the swamp' (ugh, I hate typing that). However, his current supporters are comprised of two groups: 1) fucking assholes and 2) fucking idiots. And there's obviously some overlap. Neither of these groups are worth trying to convince that Trump hasn't drained the swamp because they either 1) don't care, or 2) are incapable of understanding they've had an orange rug pulled over their eyes.
Sure, he's lost some idiots and assholes along the way, but I get the sense that his base are dug in at this point.
I think the point they were trying to make (I think) is that it's quite easy to prove that Trump has not drained the swamp and he has actually added to it, and that's a tactic that anyone who wants to turn Trump's base against him needs to be actively pursuing.