Recently a PA28 share owner thinking of converting to microlights was at Chatteris. He had a sit in our school aircraft and liked it. When he got out he slammed the door shut hard, the door didn't shut so he brought it out further and slammed it down really hard. The door still didn't shut so he brought it out very far to give it an extremely hard slam.
Luckily I was able to stop him in time, the seat belt was caught in the door, that's the only reason it didn't shut. If that's the way Cessna and Piper pilots treat their aircraft then no wonder they have to be built like tanks, I honestly wouldn't treat my car like that and certainly not an aircraft of any type.
It is no problem to teach students to treat the aircraft with a bit of respect from the start, most microlight instructors own the aircraft they train on so will get the students to treat them with at least a small amount of care from the beginning.