Yes there is, bike stolen or dismantled.
I bet nobody left a note for your fellow bikers asking them not to do it again or they will find a disc lock on it.
I bet you're right. As far as the three wheeler goes, anybody that commented on his parking seemed to agree that he doesn't care, so pointing out his behaviour directly isn't likely to have an effect. Going a step further and threatening our "fellow bikers" is probably more antagonistic then helpful.