Why pick on evolution then?
"I can't think of anything that is so insecure surrounding gravity (etc.) today, that when a concerned group of parents places a sticker on a textbook reminding students as in the example in evolution is mere theory, and not fact, they get sued, can you?"
I hope the lawsuit was thrown out, since everything is a "theory" and its impossible to prove a theory, only to disprove it. Truth has little bearing on utility. Take a falsly geocentric view of the universe and navigating a boat by the stars and the assumption that everything revolves around the Earth still works fine.
Oh, and btw, Edmund Burke never actually wrote that tagline - it is oft attributed to him and may well be something that he might have said but there is nothing in his works or those of his contemporaries to suggest that he did. So much for truth.
RIP Coyoteman