JL is not the only place that over tighten lug nuts and drain plugs. Dealers do that as well. Ford, Mazda, Totoya, all do it. Many years ago, I went to a Ford/Mazda dealership for oil/filter change and tire rotation, what they did was only oil change. Filter was not touched, tires not touched either. I checked before I left customer parking, and went back in. Service writer brought me to the tech, who happened to be a master tech, denied right in my face. I then pointed out the rust on the old filter rim, and the marks I put on the tires. Then he went silent, I stood there watching him do what I was charged for.
More recently, same thing happened on my Camry at a Toyota dealership. The oil filter was so tight at next oil change I had to use my impact wrench.
We are not going to have self-driving cars if our service industry is so incompetent. They are all properly trained, they know right from wrong, yet I find that they simply just don't follow the training. How are we going to fix that?