The best way to get those protections is from a union, which I acknowledge different people hate for different reasons, but any competent union will give its me

The best way to get those protections is from a union, which I acknowledge different people hate for different reasons, but any competent union will give its membership effective due process rights by turning at-will employment into employment governed by a bargaining agreement. The power of these "mere accusation" campaigns rests on the ability of the employer to fire based on a mere accusation, which goes away if there's a bargaining agreement in place which mandates actual hearings.