I know that. I'm not saying that isn't true. But what sparked this spontaneous idea among Democratic candidates of "I'm going to do this thing which is clearly not a salute but which the Republicans are going to call one"?
It was far less common before to even be in the position where your opponents say "now that's something I can spin into smear". It would be like me hearing that my opponent got in trouble for giving a middle finger in a video starring politicians and being like "that's the finger I'm going to use to push up my glasses from now on".