If Thanos gave you choice between the destruction of Earth or destruction of half of humanity which would choose
Well you would be hated by the other half of humanity for entire life then ? Are you willing to bear that burden?
Well, the loophole I can see here is that no timeline was given. That being the case, stall for time until we get space colonies set up, and then we migrate everyone to the colonies. Then we can destroy the Earth. Hm, I'm pretty sure this was Char's master plan back in the Char's Counterattack movie.