I know of several trails that have been taken over by bikers. Sliding their tires on downhills have left the trails so rutted that hikers can't walk on them. You have to get to the side.
I ride mountain bikes too. I don't outdrive my line of sight!
As a somewhat related aside. Oak Mountain State Park has great mountain bike trails. Built and maintained by mountain bikers. The trails are in phenominal shape. In the same park, there is a hiking trail that goes to Peavine Falls. It is deeply rutted and washed out.
Your point stands though that we should all strive to be good stewards of our trails.
