It appears that whilst most tourists prefer elephants with their trunks uplifted, the Thais themselves prefer elephants with their trunks hanging down in a relaxed manner. That is the posture of a happy elephant.
Elephants with trunks held high represent luck. I suppose that most tourists prefer luck (and all that it portends, wealth and prosperity) to happiness. The Thais prioritise happiness in family relationships above luck.
I think the Thais are much wiser than the rest of the world.