The claim that the opposition "saved Chassidus" is making the second claim.
I haven’t seen anyone make that claim. There is no way to prove that, it’s complete whatiffery.
I am saying that those who justify the extreme actions of those who opposed Chassidus by saying that otherwise Chassidus would have gone off the rails
Not sure who said this. Those who opposed it held strongly that Chassidus was treif, this was based on what they saw heard and investigated. Not purely on misinformation, as some were trying to claim, but since seem to have accepted the facts presented - ?
are in effect saying that the tzadikim who led Chassidus would have not have acted if not for those extreme actions.
Maybe they would of acted but not have had whatever success they had? Again, there is no way to know what would’ve could’ve happened, but its extremely illogical to deny the likelihood that the fierce opposition helped mitigate valid concerns.