I guess my question was meant to be taken rhetorically, as if the answer was already there. That's difficult sometimes to convey that online, though. My point was that if somebody is looking for something to steal, they're going to take it whether you've got an L lens attached or not.
When a thief finds a camera, does he/she really look closely to see if it has a red ring?
IMHO, 99% of people don't know what that "red ring" means...