You want me to give you one example of Catholics NOT calling a notorious heretic their Pope? Do you know what you are asking?
Yes, give me an example in history that EXACTLY matches our situation. If you cannot, then the uniqueness of the situation should make you pause and wonder if your viewpoint has the certainty of faith which you assume it does.
Secondly, your over-simplification of the current papal crisis mocks every theologian who ever spent decades of their life debating, praying and writing about such a situation. You are basically saying that their life-long training, education and effort spent on this topic (and for some, that effort produced entire books on the topic) and it is worthless, since you, an untrained, uneducated layman, have "figured it all out" in a few years of months (and probably less).
Finally, does it not ever cross your mind that if all the theologians who argued that a pope is not ipso facto deposed for heresy (and those theologians are many), that if they were as wrong as you say I am (and, logically, you must say they are), and if your (and St Robert Bellarmine's) view is as CLEAR and SIMPLE as you say it is, then why FOR HEAVEN'S SAKE WHY, did St Robert Bellarmine take the time, effort and energy to debate these theologians (both written and speaking)? If they were SO CLEARLY WRONG, why didn't he just say, like you do, that "A true catholic never calls a notorius heretic their pope. End of story."
How much time could he have saved? Countless hours. How much effort did he waste? Wow, hard to calculate. Probably years of his life. He must be pretty stupid. If this is the simple answer we've all been waiting for, why hasn't the Church condemned those theolgians who debated St Robert Bellarmine. She could have done so quite easily, effortlessly and simply. And, certainly, if the truth is as simple as you make it out to be, everyone should know it.
But alas, maybe the answer (using common sense) is that THE ISSUE OF A HERETICAL POPE IS NOT SO SIMPLE TO FIGURE OUT. Golly, could THAT be the answer?