Why do you assume the government didn't do anything? If anyone on those committees was paid or influenced by the NSA/CIA, they would not have disclosed it.
But standards bodies also sabotage their own work when there's no security relevance (USB's dozens of options with impenetrable names like "USB 3.2 Gen 2×2")
And the US DoD reportedly loves Trusted Platform Modules, so presumably if the US intervened at all it was to improve the spec - and yet it's got more holes than swiss cheese.
It’s true that you can always imagine a perfectly-concealed conspiracy but we see the same dynamics unfold in many places where there’s no security impact so the parsimonious explanation is that there is no conspiracy, only normal human social dynamics.
DNSSEC is one of the standards where I am confident the US government did not intentionally introduce weaknesses because the US government is the largest deployed base of zones due to a poorly thought out executive order.
