Laci and Jenner aren’t even close to Alt-Right. This is the problem you guys over in the Ctrl-Left are facing, and it’s basically the same one as the extreme Christians have (I should know). When your movement is ascendant, rejection of the ideologically impure clarifies your mission and leads to growth. When that ascendancy has stagnated, all you’re doing by overzealous rejection of the impure is to reduce your numbers and embitter people who feel like they’ve been betrayed. And then you inevitably descend into operating like a cult.
Worse, by describing all those who don’t conform 100% to your ideology as being indistinguishable from your most extreme enemies, you swell the ranks of said enemies. It’s entirely self-defeating.
If it’s any comfort, this is happening to the Alt-Right as well now, since they’ve thrown in their lot with ethnic nationalism, extreme biological essentialism, etc.