^ All good points regarding protected free speech, but exercising free speech has consequences (as Mr. K is experiencing now.) You can yell "fire" in a theatre as a form of free speech but there will be consequences if done. And not good ones. I do agree that revocation of citizenship and calls deportation are probably more of an emotional response than an actual suggested course of action. But the NFL owners are well within their rights to not offer employment to Mr. K since 1)he is not good enough to make the team, 2)the team already is stocked with QB's for the season, and 3)he would destroy locker room chemistry. #3 is one that I have not seen articulated by any ownership group but I would think it plays into their decision to not offer him a job. It is also my personal opinion that most ownership groups DO NOT want to face the wrath of the fans if they decided to offer Mr. K a roster spot.
Also, Mr. K does not have a right to a job in the NFL. He has a right to pursue a career in football, but no right exists for him to have ANY job in the NFL. There are some 'tv activists' who are claiming this, and it is hogwash. He has as much a right to a job in the NFL as I do, and inasmuch as I could have gone pro after college ball, I decided not to. (OK, so that last sentence was not completely true, but you get the point.)
I agree with your third point in that most NE fans will/wont/don't boycott the Patriots because Brady had on a MAGA hat. But it is not because they are simply tolerant liberals. (Is there such a thing?) It is because the Patriots/Brady win. If they were 4-12 for the last 4 seasons, I bet it would be a different story.
Lastly, the grotesque irony of Mr. K. protesting 'oppression of people of color' (from his Wiki page) whilst making zillions of dollars in a league that is black dominated is not lost on the fans nor the general public. Regardless, he is free to go to the CFL if he cannot get a job in the NFL. It will be interesting to see his course of action should not be in the NFL this season. It will be more interesting to see how the professional race hustlers attempt to perpetuate the 'oppression of people of color' should that be the case.