I’ve noticed that the Scripture normally drawn on to support anti Catholic diatribe is very unconnected and unrelated.
Pauline admonishment of the various renegade churches under his bishopric is also drawn from, arranged, multiplied, massaged, kneaded and then spewed forth in self-congratulatory fashion.
I think that it galls them to the core that deep within their souls that they know, or at least strongly suspect, that we are right and they are wrong.
It is up to us to convert the heathen, the heretic and the apostate. It might be a useful exercise to sort them into their categories.
Voluntary--even rebellious--self-deprivation of the Holy Sacraments has got to be torturous stuff.