Yep. If we needed it we would have done it already.
Ah, but, one could continue to make this argument indefinitely even if it were needed.
Indeed, when applied to other situations, this argument holds no water. For example:
"If I had needed food, I would have eaten already."
"If I had needed to install a security system in my home, I would have done it already."
"If I had needed do my homework, I would have done it already."
These people died of malnutrition, were robbed and assaulted, and failed math, respectively.
One cannot base the necessity of a thing based solely on the argument that if it doesn't exist then it must not need to exist. With this mindset, only stagnation lies.
also, I like to recklessly spend government money on pie-in-the-sky projects. Is that so bad?