We all make mistakes, professional or at home in our garages. It happens, nothing wrong with it. But not owning up to it, is the problem. I'm the same, I take a vehicle in for two reasons only, well ok maybe three. It's above my head (and when they F'd it up I just learn and do it anyway), I don't have special tools (like a press), or don't have time/not at home with my tools (one visit to MD years ago).
I was a mechanic for 7 years. I made some small mistakes, and one big one, caught an engine harness on fire.. not my fault, but technically it was. I went to my shop foreman and said I F'd up, this is above my head. And I was taught, learned, and fixed it. But never would I allow a vehicle to roll knowing something is F'd up, I'll take the azz chewing about it not being done in schedule over endangering someone's life due to shotty work.
This was military, not civillian. I know what you mean about new vehicles and technical work over nut and bolt jobs, but even still the newer HEMITTS, MRAPS and MATVs, STRYKERS are very computer controlled. Luckily they have on board diagnostics or at least throw codes on a screen.
In the case of my wife's truck, it's a ball joint, not a sensor. I'm not complaining about a ripped boot, damn thing is about to completely separate and cause an accident. It's not like our trucks where I can drive on a bad ball joint for two years and be ok

Hers death wobbles like you wouldn't believe, and it's wearing out other front end components, and the tires are gunna pop anytime now from being so worn on the inside. I about flipped a lid when the 'mechanic' told me nothing was wrong with it. Luckily his boss wasn't there, I'd have asked him if he would like for me to show his tech how to troubleshoot a bad balljoint, cause obviously he has no idea how to tell the difference. I told him to go back to plugging in a computer to tell you an air filter needs to be changed, and give me that older gentleman over there to check out the truck

That didn't go over well...
Sorry, didn't mean to hijack

fired up. She's contacting Sears (whom the shop went through for the alignment) to see if they actually did one, or even brought the truck in to begin with, and if they did, if they told them how it's pointless to do an alignment with the balljoints the way they are.