I'll say the jets were effective in that I don't like the jets while I am primed to try to physically stop you from doing the other thing if you try it in front of me. And I already agree with the underlying point already, so imagine how the normies that don't think about this at all feel.
"Ah, a cartoonish self-parody of activists defacing a monument I've spent my entire life feeling a sense of kinship with, I feel compelled to rethink my stance on this dry, complex political issue". That's a bold pitch for a PR stunt.