In a democracy everyone has a right to say what they believe, including opinion that's contrary to your mighty belief. One point - he's broken NO LAW. This is STILL a free country right? He can do whatever he pleases without breaking law. And there's a strong history of stars and athletes advocating varying causes.
Second point - the UNIQUE thing about United States of America since dark ages is that it OPENLY ALLOWED Political DISSENT. Now you're going to shame him for expressing his opinion on treatment of minorities? From the outside looking, that's what's wrong with America, and why it's gone backwards, not what made it great.
It's OPENNESS to People of varying backgrounds, its OPENNESS to ideas, its OPENNESS to dissent and political debate, and that consequent dynamism is what MADE USA great in the last century (amongst other things including Geography). This kind of non-sense will lead to its decline. Which will make rivals like China and Russia only too happy.
Now let's just get back to FOOTBALL!!!!!!!!!!!!!!!!
I agree!