Don't accuse me of being obtuse and conflating different situations when you just attacked a massive strawman. I'm not talking about rumours, more like someone showing up to a party at your place, acting weird from the moment she showed up, locking herself in the toilet, self-harming, then wasting weeks of your life and doing a number on your sanity after going to the police, claiming she was raped. This isn't a hypothetical.

Compared to actual real sexual assault, which IS a huge problem

You repeat some variation of this about 3 times in your reply. This is called relative privation. Two things can be problems at the same time, and it doesn't need to be a competition over which one we're allowed to care about.

The issue of how to handle sexual assault accusations is not complicated. I told you, we handle them all the time in the medical field. You default to protecting the accuser, you do a thorough investigation, if the investigation turns up no evidence, you move on.

Speaking of conflation... most people don't have the luxury of a professional environment with oversight and procedures for handling these situations. You live in a fantasy land if you think this is how actual human relationships play out, or if this is how they're investigated.