Charles LeClerc probably the most vocal about it. He defended himself online after being called a racist for not kneeling and said he didn't support the protests having turned violent or that politicians were using the protest for political purposes.

Magnussen said something along the lines of he didn't want to support the BLM political organization. Verstappen I can't remember exactly but I think he at least implied that the kneeling antics were an empty gesture.

This all with Hamilton droning on about how all the other sports are having their unified gestures and whining that F1 isn't following suit. His complaining has not really worked though because a decent amount of the grid doesn't seem all that interested in it. Honestly, I think if Hamilton wasn't in F1 they might not have even done anything at all, he's the one pushing it all.