I wouldn't be fired for supporting financially pro-gun organizations and activities, as I do. Why would Cooper lose his job for doing what tens of millions of Americans have done as responsible contributers in a democratic society?
Suppose the president of the NAACP made a donation to the Ku Klux Klan PAC. His board and members of the NAACP would demand he resign and I expect he would comply.
Suppose a Ku Klux Klan member that worked for UPS showed up at a KKK rally in his UPS uniform and did a filmed interview as a KKK member in front of his brown UPS truck. UPS would fire him.
The speech amendment protects our speech from government penalties, not our bosses.
Best,
Mike