I think I stopped trusting the U.S. government right after learning that for 40 years, instead of treating a small group of poor, uneducated people officials had identified as having syphilis, officials not only withheld the diagnosis from them, but the cure as well, just to see what would happen if the disease went untreated.
This was done even if what would happen was eventually death, which is why burial insurance was given to the unsuspecting victims as if the government was doing them a favor.
And this didn't happen a very long time ago either.