What the US did in 1948 (and the 30 years that followed) was shameful and Italy is still today suffering from the traumatic consequences of their meddling.
Guess what? Two wrongs don't make a right.
No it was the best thing that happened to Italy. Look at Czechoslovakia. It probably saved hundreds of thousands of lives, and Italy is about 4 times richer than it would have been if it had suffered under a Communist dictatorship. "Eurocomunism" was decades away at that point. Communists in any office meant one vote, one time, and then mass anti-Semitic purges following the break with Tito.
I don't think people comprehend how awful those Stalinist regimes were. They make Putin's Russia look like Sweden. Really, the only thing comparable today is North Korea.
