I would have to be off the charts bat shit crazy to want EVERYONE dead, so for me this just doesn't work in any kind of meaningful scenario.
Well i presume its just the option to kill anyone (wich i see as good thing) taken to quite extreme. :-/ But im personaly quite happy that option is presented in the game. Its bold move.
I take killing the Goblins or everyone at the Druid Grove as par for the course. Better for me would be if after witnessing specific events I kill the Druids and offer up their grove to the Tieflings to stay at, because the Druids are a ptential thorn in my side should I side with the Drow, Tielfings however could be swayed at a later date, especially by me if I have provided them shelter. I.e. more devious manipulation please Larian.