Say good bye to a very nice car. Or help me fix it. It was worse in 84

There is only one person at the shop. The owner. So it was "He" Not "they" That didn't tighten the bolts. The bolts can be tightened by one person. And yes I do know him ."He" Has a shop down the street. We all make mistakes. The car can be replaced and I am OK. I live in a small community and everyone knows each other.
First. I'm glad you're (relatively) ok.

Second. Damn. That sucks. It's a beautiful car. I think you should fix it and get it back on the street.

Third. I get what you're saying about him owning the shop. And it being a small town. But shops like his have insurance for a reason. You aren't going to "ruin" or "bankrupt" a guy for making an insurance claim against him. His insurance rates might go up, depending on his insurance and past incidents. But they might not go up. And if you claim this under your insurance, your rates WILL go up. You'll be paying for his mistake for quite a long time. Not only that. But your insurance might change how much coverage they are willing to provide and what not. Or worse, they might force you to write the car off.

He pays for insurance for the same reason you do. So that when a small mistake like this happens once in a blue moon, he doesn't lose the shop over it.