Have you had an employer of yours abridge your constitutional rights as a condition of your continued employment, lest your opinions be attributed to them (as opposed to abridging them to protect proprietary information)? If you overhear a McDonald's employee expressing an opinion, are you under the impression that the worker is speaking for McDonald's corp? Goodness, if one of your employees wears a cross and another a hijab, how do your customers decide your religion since apparently your employees reflect only your beliefs and not their own? If your employee has an old ski lift tag attached to their jacket, do all your customers assume you just got back from a ski vacation? If your customers think your employees' opinions are your opinions, they must either be the stupidest bunch of customers on the planet, or they must think that you insist all your employees ask your opinion on every matter possible and only spew out what you believe and never their own thoughts.
Unless your employees preface their opinion with "Mr Middleview Company believes...…," no one thinks what your employees have to say has anything to do with you. Just as no one believes that the players' protest has anything to do with the NFL (nor should anyone think it has anything to do with the National Anthem or the flag, though there are those idiots out there who have been brainwashed by RWNJ radio and Fox "news" to think it does).