So when, precisely, in your opinion did the Italian Republic become "fascist," or "military-controlled"?
To sum it up in poor words, the point of Gladio was to replace a left-wing government with a fascist one. This was never needed however, because the Italians were good boys and never elected a left-wing government. This notwithstanding, the Italian military secret service supported right-wing terrorism with money, weapons and judiciary protection.
The people who created Gladio were Italians elected by their countryman. They preferred a world where their country had a secret, Anti-Soviet Army directed partially by the CIA to one where it didn't. When those countrymen realized it was acting up they disbanded it.
Those countrymen were never aware of such activities, precisely because they were kept secret. In those cases when they become aware of them, the few persons identified as responsible for them had to spend the rest of their lives in South America or Africa to flee from Italian justice.
As for "terrorism-ridden," Italy has never had a year in which Gladio bombings made up the majority of terror attacks. There were leftists, and other Fascists active in the same period. Most of the time Gladio was third, behind the various leftists, and the Ordine Nuovo Fascists.
If we want to be precise, no bombing (or targeted murder) was ever set up by "Gladio". They were carried out by right-wing terrorists that were sponsored by "deviated" Italian secret services. But frankly, counting the victims of the "red" terror versus the ones of the "black" terror seems silly to me (others have done it, and in case you're interested, it's "a draw"). I can assure you that I despise the KGB-sponsored killings as much as the CIA ones. The point of this discussion was that the USA's only interest was a peaceful and boring Europe, and in my opinion terrorism is incompatible with peace and boredom.
In fact I think if you consult a dictionary, you'll note that "military control" is generally considered the opposite of having terrorists run around your country, so that Italy in the 70s and 80s was suffering from a distinct lack of military control.
Military control would have been an option of last resort, and it was never put in place. However, in certain times we got pretty close to that. It's not surprising, as the rest of southern Europe was not democratic until the 70s, and something like that went on in America's backyard.