

I don’t think people “think about joining” a group like this the way someone thinks about joining a sports team or book club.
There will always be people on the fringe who are not too far gone.
“Persecution” of the minority is always a recruitment tool.

Actually it’s the opposite.
It makes “joining the racists” unappealing to the vast majority of people, but these groups are not trying to recruit the rational majority of people.
The opposition is used by these extremist groups to make the individuals they’re trying to recruit feel isolated and persecuted by society at large. It’s a well documented recruitment tactic. Literally part of the pipeline you’re talking about.