What can they do to make you whole, exactly?I am a “stuff happens” kind of guy. I work in pharmacy and deal with the public regularly and have to resolve issues, some of which are quite trivial. So I understand both sides. But for something that can result in your wheel falling off? That’s not something I put in that category. I would and do expect the business to take care of their error for me.
Maybe they missed one lug nut. Maybe their torque wrench needs calibrated. Maybe one just worked itself loose. All three scenarios are common, with different levels of fault.
You're getting worked up over a loose lug nut. You identified the problem. No one is hurt.
Now shrug it off, use the wrench in the factory tool kit to snug them all down, and call the shop to tell them how pissed off you are, if you must.