The basis for my assertion is in my post above. In both the March for Life and various political campaigns I’ve attended, I was bussed to a central location (admittedly from out-of-state in the case of March for Life) and then handed signs there.
I haven’t been to any FR demonstrations, which seem to be more spontaneous than sponsored. Perhaps it’s not so much a function of the Left or Right, but of the organizational support behind the event. A few Leftie environmental rallies I’ve seen in my local college town are all homegrown and look it (in several sense of the word.)
That may be. I don’t doubt our experiences differ in those respects.