I looked online....Looks like most injuries via unproperly assembled bikes (specific search to Walmart) are minimal to moderate. Things like handlebars loosening = in a ditch lol=busted nose lol .. It appears that cases are won and lost and many seem to settle out of court. Appartently Walmart had a separate company assemble bikes decades ago then shifted to employees. There is a certification training program they can and apparently do put in place.

It seems from what Ive read in the search that realistically is simply a cost of doing business...The suits dont have heavy injuries but seem more out of anger.

Reality is that wont stop them from ever selling bikes. They sell too many. Plus the same standards do apply for LBS so they can and do get sued as well....

The grand lesson here is simple. It does not matter where you get the bike, bring it home, go thru it yourself, its not difficult at all, then you should be good to go....The best assembler is yourself when it comes to a bike