All it took was one guy costing him millions of dollars. One guy he trusted that ended up ripping him off. Then he became a paranoid wreck. He either got people killed or tried to because he was still bitter about what happened to his old casino in Las Venturas. He wanted to sell people down the river before they did the same to him.
A few years down the line, JD O’Toole, wanted to be a Leone after having been a Sindacco. There’s an old saying that applies in relationships which is “if they’ll cheat with you, they’ll cheat on you.” It’s sad O’Toole was lured into a crusher in Harwood and shot in the back of the head by Mickey Hamfists, one of Salvatore’s hitmen. It’s sad but it was justified. Salvatore could never have trusted him if he screwed over his own boss.
He did sniff out Massimo Torini’s plan to take over Liberty City perfectly so credit’s given where credit’s due. Torini was trying to get the Leones, Forellis and Sindaccos to go to war with each other. Of course he let on that he was just trying to ease the tensions between the 3 families but he was a Capo in a different family – anybody could see that he was lying.
Go forward a few more years and he tried the same thing with Claude Speed. He wanted him to go into a car that was rigged with a bomb. We all know he didn’t and Salvatore ended up having his “day” not long after.
So what’s the point of all this? What happened with Salvatore is (usually) a fantasy. What he did was a reality. It doesn’t matter how extreme – the concept is the same. It’s a reality of what happens when someone’s hell-bent on keeping their spot and sees certain other people as a threat, even when they’re not trying to be. That’s not good business.