I see both sides of this argument. On the one hand, I agree that the responsibility to combat interview hoarding shouldn't be on individuals. The AAMC should've created an interview cap. There is no reason why there can't be a universal day (or week) of interview invite release, with enough spots for all applications invited. Cap the amount of interviews that each applicant can accept to 10-15. This way, no one complains that interview caps will keep them from attending XYZ interview that they receive later in the application cycle. This responsibility should be on the AAMC, not on individuals. If someone's application and hard work netted them a lot of interviews, and they have $300k in student loans on the line, I can understand wanting to go on as many interviews as you can.
I am someone who received 25+ interviews and I'm applying IM. I dropped a decent chunk once I realized I had enough in my target region. I basically dropped all OOS interviews. I definitely had other applicants in mind when making this decision, but also, interviewing is damn tiring and I'm burnt out at this point. But I can definitely understand the mindset of not wanting to drop any-- I felt weird every time I did, like what if I'm in the one person who doesn't match despite the stats. It's hard to be levelheaded when there is so much on the line. I don't blame anyone for making either decision and I don't think I would judge a person's character based on this. As long as you're not cocky about it (like lol yeah I don't want to go to this program at all but I'm going to go on this 40th interview because it's virtual so why not...have seen people say this), I think it's more about how risk averse you are than being about your personality/how kind you are.