But how is you statement about goblins any different then the way people felt about Drow at one point yes its easy for adventurers to slaughter goblin tribes as low level adventurers but they are just that tribes they have culture, religion, ways of doing things and how they treat themselves or others its one thing to kill a creature and go that was a mindless beast its another to build on the world when you realize those things you always considered monsters think have familys feel laugh and kill like most other races
It's more complicated then that, for example Gobliniod races were playable in Zakhara, which is a subsetting of FR.
Plus WotC is moving away from innately evil humaniod races period, admittedly for the wrong reasons.
