BS. They were riding illegally, on illegal trails

"Jackson Dempsey, Psychiatrist, Booby-Trapped Oregon Bike Trails" - Huffington Post

"Psychiatrist pleads guilty to booby-trapping mountain bike trails using ropes and nails" - Daily Mail

"Psychiatrist jailed for booby-trapping Oregon mountain bike trails" - NY Daily News

He was sabotaging BIKE trails ! You are lying again.