>>510430180 (OP)Because they believe they can get away with it. We spend most of our teenage years around people our own age and that tends to calibrate us to our fellow teenagers. Nobody bats an eye when the 16 year olds are dating and this is expected to suddenly go away at 18. Ebebophilia doesn't fade when someone turns 18 but most people have the good grace to ignore it. People have morals or at least fear of punishment.
However, being Absurdly Wealthy means you can pay off all but the biggest fines without blinking an eye and hire the best lawyers to get you off the hook for more serious crimes. They start seeing themselves as something superior to the common man and believe the rules no longer apply to them.
Finally, you've got Affluenza where the rich are so phenomenally bored and oversaturated that they're willing to indulge ANY vice in order to entertain themselves. The more forbidden, the better.