Even if I take your assertion seriously, he should have been warned to stop at the first accusation. Literally all he needed to do at that point was to not try

Even if I take your assertion seriously, he should have been warned to stop at the first accusation. Literally all he needed to do at that point was to not try to date within the company, even the most clueless guy figures that out after a formal warning. If not, I question his basic reasoning skills. This isn't a case where it was the first accusation nor was it where he or other people in management were unaware (the issue was escalated), the behavior was inappropriate. The problem is the management was told there was an issue, repeatedly, with evidence, by several people, and choose to not act upon it. Doesn't matter if it's sexual harassment or incompetence, employees won't tolerate bad cultures if they can help it. This is a lot of things, sexual harassment, work culture, accountability, office politics, etc., but some guy being clueless about women isn't one of them.