A good analysis of what leads anti-Catholics to believe and repeat bizarre and false rumors about the Catholic Church described it as a combination of ignorance about what the Catholic Church actually teaches and did throughout history, and a willingness to believe the Catholic Church was capable and willing to do these terrible things. So long as they have these two traits, they are willing to spread the most vile falsehoods about us.
Unfortunately, that mindset seems present among many Catholics infighting today. It’s not limited to one faction, but it seems to affect Catholics across the spectrum. The mindset leads them to view other Catholics who seek to follow the faith as openly supporting evil because they are ignorant about what Catholics they dislike hold, and believe them capable of supporting terrible things.
So we see radical traditionalists willing to believe the Pope supports heresy when he calls for mercy. We see “Spirit of Vatican II” Catholics willing to believe that Catholics who insist on the moral teachings of the Church are merciless. We see anti-Trump Catholics willing to believe that Catholics who voted for him supports his actions that are at odds with the Catholic faith. We see Catholics who voted for Trump assume those who couldn’t vote for him in good conscience must support evils contrary to the teaching of the Church. I could go on with these dualistic examples, but that would get boring—and long.
The point is, in each of these cases, the Catholic infighting involves ignorance of what those they disagree with actually hold, and a belief those they disagree with are willing to support these things. Meanwhile the accused resents the accusation. In many cases they do not support the evils, but instead are either following a Church teaching but have a different view of how to apply it, or are mistaken about what the Church holds and do wrong while thinking it is right.
Yes, people can be in error about what the Church teaches, and need to be corrected. Yes, some Catholics might unfortunately support things contrary to the Catholic faith, and need to be corrected. But if the person who decides to correct does so with the assumption that those who disagree with our prudential judgment or are in error do so out of malice will not bring them out of error. It won’t evangelize them, but we’ll probably lead them to think we’re the one in error
And if they’re not supporting an evil, our accusing them of doing so is rash judgment, or maybe even calumny.
So we have an obligation. We have to understand what they actually hold, to make sure they need correction before we act. If they do, we have to do so in charity and mercy, not harshness. But if they don’t, then we’re just being factional and judgmental, and we will have to answer for that and the harm it caused in the final judgment.