A pervasive problem almost everywhere (check out California). We have a downhill trail here in the Brokanagan Valley that drops from Silver Star to Vernon (Spanky's). It's been there for decades. Some unbalanced locals have done the same sabotage to discourage riders. Before moving to Vernon BC, we lived in Phoenix AZ for 10 years. A small subdivision was being built adjacent to the Phoenix mountain trail network. Locals tried to block access to the trails. An unbalanced rider decided to burn 9 of the homes before they were completed to make his statement. He was caught and criminally charged. I believe it did encourage people to think twice about blocking trails near their homes. Extreme people on both sides. Nobody wins.