Do shops still sabotage cars for profit?

2 stories concerning my local Dodge/Chrysler dealer: My wife took our '07 Liberty in yesterday for its 21,000 oil change and while there the tech came out with a dirty air filter and told her to let me know the Jeep needed one. Picked one up today and replaced the OEM one (which was dirty). While looking up the air filter number at the store I noticed it seemed to be a Jeep-specific air filter (and the dealer doesn't sell and most likely stock Jeep specific parts). The dealer has always given me the choice of doing the work myself or having them (or anyplace else I chose) do the work.

2nd story - I had taken my RHD mail Jeep Cherokee in to the above dealer for state inspection and it failed because of lower ball joints. No problem, do the job since I didn't have time. Picked it up and used it on my route the next day. Got 12-14 miles up the road and kept hearing something really odd. Got to the sub-station post office and called my wife to come drive me the rest of the route cause something was wrong with my Jeep. I decided to deliver one more package right up the road from the sub PO and got less than a quarter mile when the left front wheel fell off and tore up the fender as well!! Called the dealer since they were the last ones to work on it. They had the towing guy come pick it up. They let me know that the right front wheel was somewhat loose as well although not like the left - the tech had not tightened the lugs up. They replaced not only all the front lugs/chrome nuts but the rears as well and replaced the fender, all no charge of course. Owner's son (the service manager) took responsibility and readily admitted the tech (and the service department) screwed up. We still take our vehicles there.