If a government agency doesn’t use vaccines as a vector for some ulterior purpose, then it’s nothing like the other time when it used vaccines for some ulterior purpose?
The pronoun 'it' in that sentence is referring to tens of millions of different people in different centuries. It is absolutely silly to pretend that they're a single actor.
Again, you're saying this as if it is a monolith, which it isn't. The information you're asking for isn't something that "the government" as a whole even has, only a very few specific people ever had the information and they're probably dead now. And certainly the CDC/FDA/NIH doesn't have a clue. So distrusting them for something they don't even know about is hand-waving away a whole hell of a lot of nuance here.
You might as well say that you're not going to trust anything Tom Brady says until the NFL tells the truth about Nicole Brown's death. Just because someone is a member of a group doesn't mean they're all acting in lock step.
If a government agency doesn’t use vaccines as a vector for some ulterior purpose, then it’s nothing like the other time when it used vaccines for some ulterior purpose?