I don't think Google could do that when there hasn't been a criminal case. I don't particularly like this situation but I also think it would be problematic to fire employees that were not part of the specific rumored incidents.

I'll grant that destructive cults are different than established religions, but firing these workers specifically over the sexual allegations wouldn't be much different than firing an employee who happened to be a deacon in a their local church in a Catholic diocese where the Cardinal abused children.