I think docks should be not bashable by hand because you use a lot of resources to build it and then anyone with a vandalism character can just come and destroy it easily. It would be different if we were able to pallisade around the dock but since we are not able to do that i think docks should only be bashable with the use of a catapult or ram.
Anyways, feel free to discuss about it and give other alternatives if you think my idea is bad.