Yeah, but construction guys have some training. Here, and I am sure more common in the wider chainsaw user world, there are people that can't mix gas, don't know that chains need to be sharpened, and mount their chains backwards. I mean real basic stuff. A couple of months ago we had a guy here, with a poorly running saw, and all sorts of suggestions were offered, and finally the guy admitted that he had taken the muffler off. Apparently he thought that was a good idea, and had no idea it would cause problems. Stihl has to make it idiot proof, and even then there is an idiots idiot out there to find a way to make it a fault ridden saw, and who will blame the injection system.
They also don't own these specific tools most of the time. So they couldn't care less about them. Which is almost as bad as a person that knows nothing about a 2stroke.