Our government has now declassified the truth of the matter: The Gulf of Tonkin Incident, on which the Vietnam War was based, was a hoax.

[link to en.wikipedia.org]
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In 2005, an internal National Security Agency historical study was declassified; it concluded that the Maddox had engaged the North Vietnamese Navy on August 2, but that there were no North Vietnamese Naval vessels present during the incident of August 4. The report stated regarding August 2:

At 1500G, Captain Herrick (commander of the Maddox) ordered Ogier's gun crews to open fire if the boats approached within ten thousand yards. At about 1505G, the Maddox fired three rounds to warn off the communist boats. This initial action was never reported by the Johnson administration, which insisted that the Vietnamese boats fired first.

and regarding August 4:

It is not simply that there is a different story as to what happened; it is that no attack happened that night. [...] In truth, Hanoi's navy was engaged in nothing that night but the salvage of two of the boats damaged on August 2.
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Presidents Johnson and Nixon were therefore war criminals guilty of the mass murder of millions of Vietnamese, according to Christian teaching and international law. They were also guilty of murdering 50,000 Americans as well.

So tell me why we should believe anything these mass murderers tell us?