And a word from a rabid Clinton supporter
Well, if someone is pro gun and they have armed security or carry a gun nobody cares. If someone is anti-gun and they have armed security then even someone who is entirely pro gun might rightly call them out for their hypocrisy.
Same idea applies in this case.
Since Republicans at least pay lip service to the idea of family values and marital fidelity as being positive things, it opens them up to having their failure to live up to those ideals pointed out.