I read that Diem was a good Catholic leader, he allowed the Buddhist to practice, and our gov fell for the false VC propaganda like the monk ѕυιcιdєs.
You ask whether Ngo Dinh Diem was good. The short answer is no. A longer answer is no, he was bad; indeed, he was very bad, but as so often happens, he wasn't the worst villain in the international sandbox. On a smaller scale, Ngo was analogous to Hitler, who while profoundly wicked was small potatoes compared with the off-the-charts trio of FDR, Churchill, and Stalin.
"Our government," far from falling for VC or any other propaganda, was a big creator and exporter of its own propaganda, very little of which was reality-based. It was up to its neck in roughneck politics in Southeast Asia at that time. The list of US participants includes the CIA, mercenaries (both American and French), and military and civilian "advisers" of all sorts. The level of "management" (i.e., active interference in the affairs of a foreign power) of the Vietnamese situation increased markedly after the fall of Dien Bien Phu (May 1954), but at least the Eisenhower administration was more or less content with observing, at a certain remove, the dangerous and dicey jockeying for position and power then going on among the local commies (Ho Chi Minh's crowd) and the increasingly antagonistic Soviet (Jєωιѕн) Reds and Chinese Reds.
The waste matter came into contact with the electromechanical rotating device with the arrival of the Kennedy administration and its cadre of wacky pseudo-Christians and bloodthirsty Jєωs (many of whom were of the age and the educational and maturity level of today's average CI commenter), all of whom thought that the God they didn't believe in had given them a free pass to rearrange the entire world's affairs to suit themselves. To cut to the heart of the matter, Kennedy authorized ever more "advice" and subversion, and when Ngo and his family and their cronies, who had never actively resisted US interference (certainly not in public), didn't jump high enough to suit Washington, the CIA was authorized to back—more accurately, organize—a coup to replace Ngo and his crowd with people hardwired to DC.
By the way, it was no coincidence that the CIA and the adviser cadres also had close ties to various Buddhist leaders who wanted a bigger cut of the pie, too. Finding guys in their ranks nutty enough to immolate themselves for the cameras can't have been easy, but surely it was no harder than it has been for various terrorist groups, both foreign and domestic, who regularly find guys willing to blow themselves up for Allah or Obama or international Jєωry.
Note that it has always been the claim of the Kennedy idolaters that Jack was shocked,
shocked, to learn of the assassination of Ngo and his brother by the Vietnamese crowd acting for the CIA, which was supposed to send them all off to comfy exile somewhere. Oh sure. If JFK didn't actually give the order for the murder, he was at the very least well aware that it was in the cards when he authorized the coup. The fifty years' worth of claims that there would have been no Vietnam War had Jack not been killed by a horrid assassin, acting entirely alone, in Dallas aren't even worthy of the name fairy tales. They are outright lies.