"Front wheel fell off" could mean a bunch of different things here. If the wheel actually became wholly separated from the vehicle, at 15,000 miles, that would most likely be due to incorrectly torqued lug nuts after a tire rotation. Those torque specs are important, and undertorqued lug nuts can work themselves loose, putting undue stresses on the lug bolts, which snap, and there you go. Such a situation would not be Tesla's fault, rather the fault of whoever rotated the tires.

Or, "front wheel fell off" could mean something like a ball joint or tie rod end failure, which could cascade into a very unusual wheel position, easily described as "fell off," while still being connected to the car by the strut mount. That kind of failure would be Tesla's fault, and would align with the mentioned "collapsed suspensions."

In any case, the car would make incredibly horrible noises and vibrations well before a catastrophic failure. These kinds of mechanical suspension parts do not go from "perfectly fine" to "completely failed" in the blink of an eye, even if they do fail far before they should. I'm not putting the blame for the failure on the driver of the car, but I have no problem blaming the driver for letting a situation like that get to the point of catastrophic failure on a brand new car.

Edit: @TheChurn - care to tell me what I said to deserve your downvote?