If you want to make political statements that are highly divisive you can't forbid dissenting opinions lol
You're only saying this because you happen to agree with the statement being made.
What if the players were making some gesture in support of Israel, Bolsonaro or the CCP? Should dissenters be quiet too?
When you put political messaging onto the pitch like this, you can't just ban dissent and force everyone to agree with you. That's why you should keep it out of football. Football fans are united in their support of a team, not the policies the current crop of players happen to espouse.