> I think the implication is that while they may have no present use, they will have future use when they develop into adults. I think even this assumption is

> I think the implication is that while they may have no present use, they will have future use when they develop into adults. I think even this assumption is dangerous, and besides, you're just kicking the can down the street (how do you define a human's usefulness?). The simple truth is that not everything on this planet needs to have a use, let alone a positive use. This goes for both things and matters that we have control over (science) and things we have no control over.