a pacifist as the paradox of tolerance is a difficult thing to have to come to terms with and I’m fundamentally a flawed human being
Don’t think of it as a paradox - tolerance is a social contract, once you break the terms you’re no longer protected by that contract because accepting that would nullify the contract for all of us.
The quote clearly states ‘joined the party’, those are NOT collaborateurs, those are members of the Nazi party, or as explained - Nazis.
Nobody was threatened to join the party, historians agree on that, people who joined were either true believers or did so to gain some sort of advantage.
The NSDAP, at their peak had 8.5 million members (1945), so around 20-25% of the German population at the time. We can argue about the other 80%, there is some nuance to be found there, of course. But those 20% Nazi Party members were Nazis, no nuance needed.