I guess the issue is whether we sacrifice philosophical/scientific accuracy for punchiness. Einstein probably didn't really say it, although it's often attributed to him, but "Everything should be as simple as possible but not simpler". 'Evolution is a (highly successful and well supported) theory (in the same way as general relativity is a theory)' is just as punchy as 'evolution is a fact', if we omit the parentheses, and if we can't be bothered to try to teach people the difference between the everyday and scientific meanings of the word 'theory'... Dumbing down for rhetorical purposes is still dumbing down.