Otherwise, how is anyone going to determine the truth of the allegations?
If the behavior was non-criminal then the decision should be made through normal non-profit governance mechanisms. We have due process of law for a reason which is that people are innocent until proven guilty and there are the proper protections to make sure a fair trial occurs.
Another well known non-profit in the biotech space received a 20 million donation and right after that a group of people kicked out the founder citing perceived sexual innuendo in old emails that did not risen to the level of a criminal offense. The donor wanted their money back, because they had given it to support the founder and his mission, but it was too late.