We're waiting, John, because Charles Widmore, the man who's trying to capture me and kill all the rest of you, knows about this place and knows that what we need is inside.
But if you're a repressive government searching for political enemies, you might instead remove them, eliminate them, disrupt their social group, and those who remain behind lose social cohesion and organization.
It's a bit disgusting. Indeed, for the pick-up artists, falling in love with someone is a waste of time, it's squandering your seduction capital, so it must be eliminated like a disease, like an infection.
So changing or eliminating a population is practical only if that species has a fast reproductive cycle, like insects or maybe small vertebrates like mice or fish.