Other stuff matters.
“let’s take a step back and use a different example: Child labor. Child labor is very “useful” if you want cheap labor. It’s 100% deplorable to use it or accept it. Child labor is a monstrosity. But if “useful” is enough, do we need to accept child labor? Palantir surveillance software is useful to some. Building closed source proprietary software is useful (for the people selling it). Usefulness is a very weak argument in support of something.”