good question.
i think 3 reasons:
- they're domestic, and we don't sue domestics because we're patriotic and we'll buy garbage just to fly the flag. look at all the crap people buy from detroit. [except that now, a lot of the componentry comes from china, but shhh, don't tell anyone...]
- they probably don't have any money so there's be no lawyer fees.
- it's "guaranteed". want a free replacement?
personally, i'd be much more interested in a lawsuit about red rear turn signals - the most bizarrely dangerous anachronism on the road.