I would never sue if that happened. However, you can't count on all people to have integrity ... so you make a very good point.
Our litigious society is also at fault. TMS USA, like all large corporations, has a fleet of laywers that look for ways to "protect" the company. If they bring in and sell an item that was not originally intened for and tested for and certified for this market it could be argued that there is an implied "certification", or warranty, or whatever, that does not actually exist. The bean counters do not like the potential liability.
Here is an example:
Let us assume that TMS USA "allowed" an Austrailan sub tank to be imported into the US and said vehicle was subsequently involved in a collision and said tank caught on fire and burned the truck (hopefully less occupants) to the ground.
Who do you think the plaintiffs' lawyers would go after?
I'm just sayin'......