Talk is cheap and they are cowards
In the past, Catholic organizations have sprung up when there has been a need, Legion of Mary and others. Maybe there is something, a group could be formed by parishioners, by lay Catholics, really, demanding and pursuing actions that would see non-faithful Catholics leave the fold. I'm not sure how to word that, in a sense, I'm not one to judge but on the otoh, perhaps there is some sort of activism and action against our errant brethren. It's not strictly the responsibility of the Bishops.
Christians have been fed to the lions for their faith but we don't have to look 2000 years ago for such examples, there have been many admirable examples in modern times.
I know a lot of Vietnamese Catholics, they certainly don't fall back on their responsibilities to the faith. When the Vietnamese Mass is said Sunday morning at 8 or 9 AM: everyone goes, the place is packed for a relatively early Mass and it's the height of reverence that they show.
They’ve also known hardship and persecution. THAT is what makes the church strong.