Stop in for a cup of coffee

I actually feel pretty bad about it. I even told the owner I just wanted the bad tire replaced and the rest wasn't necessary but he waved me off.
Why would you feel bad? Their internal issues are not your problem. If what you were told is the true story, that guy probably left hundreds of cars out with unbalance, unsafe tires. That doesn't explain why the old tire was still in inventory for a rookie to accidentally use it. Or why nobody was checking his work. I doubt he files his own paperwork. Probably goes to someone in the office for billing.