Because tigueres know rich Dominicans have the influence and political connections necessary to cause mass havoc on a target at best, or get off scott-free if he uses deadly force on a tiguere. Like your rich relative in Bonao. Nobody, I mean nobody, will mess with him because they know the consequences.
I specifically stated tigueres, not Dominicans. Think Venn Diagram and overlapping universes, as in "All tigueres are Dominicans, but not all Dominicans are tigueres."
I told the story years ago about our home invasion when I first moved to Jarabacoa, how we (really, I, as Alida just held a 5 iron ready to swing if the guy I was manhandling on the ground, the sinews of his arm and shoulder almost at the breaking pioint, accomplished a reversal of fortune) physically kept the perp at bay until the police arrived, 6 guys with guns drawn, and took them away. And how the guys were roughed up in jail, and how the family came begging us to not press charges because they were "good boys." And how the police chief brought the guys in and gave a Come to Jesus in our presence, pretty much stating "You broke into their home because they are rich foreigners who you thought were soft and didn't think would fight back. You are lucky he only hurt you, because you know if he had been a Dominican he would have killed you."
I took it that the local PN Chief knew the lay of the land and how tigueres think.