I think you don't realize the pain such suppositions cause. There are an awful lot of well meaning but imperfect people who truly want to rid this country of the blight of racism. So to suggest that they are closet klan is demoralizing at the very least.
This is the crux of why I've been very critical of Kaepernick's protests. Given the progress made, and the fact that most white people really do want to treat people like race doesn't matter. But then you have this guy saying he can't support the flag of a nation that oppresses black people? **** you Kaepernick. Then he tries to claim he didn't mean the whole country? Then continues kneeling? Because why? Why continue with the thing that is NATIONAL?
Now. I'd have nothing but respect for Kaepernick if he'd have just said, hey. I didn't mean to say the whole nation oppresses black people. I just want police brutality against black people to stop. I still respect my country. And I recognize it's not the nation that oppresses black people. So I'll find a more indicative way to express what I'm protesting.
I'd have defended him. I'd still not put him on a pedestal to be venerated as best citizen. But I'd have defended him. Saying you didn't mean something some way, while continuing to behave like you really did mean it. I'm just going to strongly suspect you really meant it.