And these are largely the same people that would wear flag-emblazoned clothing, have flags on disposable items, fly badly worn flags, and all sorts of things that fail to show proper reverence for the flag. So I suppose that, in some ways, it makes sense that they'd also be ignorant of the proper way to burn a flag when pressing for an anti-flag-burning amendment. (To be honest, it's supposed to be burnt in a solemn ceremony, and the burning that they're against is specifically the obnoxious in-public sort. Which doesn't make the notion of a constitutional amendment about it any more palatable.)

Edit: Here's a page that details flag-related "laws" in the US Code.