We won't sort out anything which might just benefit someone else at our own expense.
It's the 'Tragedy of the Commons', situation.
Or more to the point. Imagine a Polar Bear is coming after you, viewing you as a meal. You've been told that two things will result. One, that your death won't hurt, and two, that your death will save the species from extinction.
And then you're given a rifle.
Admit it. You're going to put a bullet through it's head.