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That's a straw man. The problem is tons of research and development won't happen without the state, but the main avenue the state funds development (as opposed to research) is the military. There are many possible futures, and the world is highly non-ergodic, so there is a real cost here to biasing the development of technology in this matter. "Opportunity cost" doesn't do the concept justice. We don't have to stop military research, but we should bring up the Arpa-E and other such things to bring balance to the situation. |
The reason the op's comment is not actually a straw man (https://en.wikipedia.org/wiki/Straw_man) is because the first governments were developed out of a necessity to ensure a unity of peoples, the functioning of essential systems, and the protection of said peoples and systems. It's also why (for instance) the very first sentence of the US constitution has multiple touch points with national security:
> We the People of the United States, in Order to form a more perfect Union, *establish Justice, insure domestic Tranquility, provide for the common defence, promote the general Welfare, and secure the Blessings of Liberty* to ourselves and our Posterity, do ordain and establish this Constitution for the United States of America.
To summarize: defense is how so much of our monetarily non-viable societal advances take place because defense is primarily why governments exist at all. Even arpa-e (thanks for your edit—it's a good topic to bring up) exists to minimize our reliance on foreign energy, which is directly motivated by national security.