I actually don't think many people would care one way or the other about the bikes if they weren't doing all kinds of stupid things in the middle of oncoming traffic. Ride bikes? Fine. Share the road? Fine. Pop wheelies in the middle of the freaking street with cars right behind you? NOT fine. Cut in front of oncoming cars with inches to spare? VERY not fine.

They responded to skateboarders' needs by creating a skateboarder-designed skate park in South Philly. Maybe the next thing they should build is a track where these dirt bikes and ATVs can do all the tricks they want, without causing traffic accidents.