As Turnbull says, Tom was a lawyer and lawyers are trained to convince people, not threaten them. Tom was not a Sicilian, so he did not have a Sicilan's cunning. In any case, some lawyers are better than others. But keep in mind that Vito taught Tom to never threaten and to always reason.
"Generosity. That was my first mistake." "Experience must be our only guide; reason may mislead us." "Instagram is Twitter for people who can't read."