Yes, that is the other side of the coin, that people are not just attracted to change because of loss of faith in the mainstream, but actually going over to support the populists.
And this is not aimed at you, but I do see all too often that people in the more mainstream spaces look at that side of the coin exclusively. "They're supporting reform because they're racist/stupid/brainwashed/propagandised". Sure, sure, those are definitely factors. But the opportunity to do that brainwashing and propagandising is there for a reason.
And those two effects feed off each other in a way that either one of them could never accomplish, the 'sum' (or rather the difference or negative sum) is much larger than those parts individually.