We rode the Tunnel trail in Santa Barbara on New Year's day. The trail was in great shape. We did find several large boulders that someone had crowbared from the side of the trail and planted in the middle of some of the single track. We removed them and placed them on the side of the trail so the next riders wouldn't have to deal with it.
I find it funny that someone will destroy the habitat in an attempt to "stop us from destroying the same habitat." Makes no sense at all, which is par for the course when addressing / discussing any fringe group.