By creating an "orthogonality thesis" that we defend as part of our arguments, we make it sound like we have a separate burden of proof to meet, whereas in fact it's the assertion that superoptimization tells us something about the goal system that needs defending.

So: evolution tends to produce large-scale cooperative systems. Kropotkin, Nowak, Wilson, and many others have argued this. Cooperative systems are favoured by game theory - which is why they currently dominate the biosphere. "Arbitrary" goal systems tend not to evolve.