Most Italians were not onboard with Mussolini's sudden racist U-turn. Everyone had to put up a public display, but Mussolini himself later complained that even within Fascist ranks there was a lot of silent obstruction to the racial measures. And even he was not willing to go to the extreme, until the country disintegrated in 1943 and the Nazis took over.

At that time was either the army or being outlaw, and he had a big family on his shoulders, I think very few of us today would have the balls to go against the status quo and sacrifice everything, besides you can’t reasonably think that every single Italian in the army at that time was a monster. Considering the consequences. Btw they weren’t Jews, when Mussolini was arrested and the Germans took over anyone who would refuse to fight for the German cause was sent to concentration camps.