1) Never trust a civilian that says "these weapons you want are not very effective or what you need". He is not trained or capable to make that argument.
Why not? Is it impossible for civilians to study military matters? Are you saying that all military historians are quacks? You realize that weapons development and production is done by civilians, right? And that our military and its funding are under civilian control, which is also the case in China and Russia? Are you aware that people (even in the military) always want things that make their own job easier, regardless of the overall cost? And that always giving them what they want is bad management?
You can boil down his argument to what I originally said -"these weapons are good at killing people"
No, you can't. His argument is that hypersonic missiles will not give us enough of an *advantage* in killing people (or destroying equipment, which is arguably a more important use) to justify the cost. Absolute destructive power is meaningless on its own. A weapon only gains value in the context of specific opponents, strategies, and doctrines. In the context of mutually assured destruction, a hypersonic missile is useless.
You're trying to paint Gubrud as some sort of naive hippie who doesn't believe in war, and that's simply not supported by the article at all.