There will be a certain small number of priests who need some kind of association.
Most do not though, and this should be respected. But it is not at all being respected when you have certain people saying that priests "need structure", meaning, "Join the SAJM or you are a bad priest". It's so insane, I just dont know where to begin.
A lot of priests, nay most, will join such an association because they are simply insecure and weak. Something fundamentally wrong with them, and such priests will end up going off to the warm and fuzzy embraces of Modernist Rome eventually. They will weigh down the other priests in the said association, til they eventually cave in.
This is exactly what happened in the SSPX.
God is purifying his faithful. Asking us to take up our cross. Question is: What will we answer?