>>85537482I've always thought that Riddler shouldn't warn people about his crimes beforehand, but leave riddles at the scene that could help a particularly clever person track him down.
Riddler would engage those people in a game of cat-and-mouse where he makes himself the mouse on purpose to prove that he's smarter than the people who want to catch him.
I just think that this would make the Riddler appear more intelligent, in that by the time people figure out what's going on the Riddler's already committed a perfect crime and the only way you'll catch him is if you play his game.