I don't really think that's totally true. Being a symbol isn't more important than not murdering people. And while John was totally wrong, the guy he murdered just tried to murder him and did help murder Lamar. None of the people Clint murdered did anything to him, and he killed out of some random unrelated rage due to his insta family. Even if John is wearing the symbol of the USA, or is more visible, that doesn't matter. Sam and Bucky turned on John but what did the Avengers do about Clint? Nothing. That's way worse than the symbol of a country killing a guy
And that's what bugs me. Avengers playing favorites. It's why Steve was wrong in Civil War. Because the Avengers have agendas too and they're not always right