Has anything ever happened that wasn't the RV Park's fault

This morning has an irate guest complaining the breaker in his site kept tripping all night long. Went to investigate, they have a 40 foot pusher and were in a 50 amp site. Trouble was they had adapted down their 50 amp plug to a 30 amp plug and then adapted that plug down to a standard 20 and it was the 20 amp breaker in the pedestal that was tripping. Tried to explain to them that having a 50 amp rig would probably draw way too much power for a single 20 amp circuit and they should remove the adapters and just plug into the 50 amp receptacle. They promptly berated me and told they had traveled across the country and never, ever had a problem, so it has to be the park's electrical system.
I can now add this to the wifi system that doesn't work and it is the park's fault because the guest has the wifi turned off on their computer. The park's cable system doesn't work and the fact that the guest didn't have a cable connected to their television was immaterial. It's the park's fault the guests didn't know the roads in Montana are mountainous. It's the park's fault the local propane company isn't open on Sunday. The park should be telling all the guests that there isn't a Walmart nearby and the local grocery store sells milk for a dime more than it costs in their supermarket.
I'd have little whine with my cheese, but the local liquor store doesn't carry the boutique label my sophisticated palate demands and that's probably the park's fault as well.