The Mafia as a secret society need more of capable men able to run white collar rackets that a men that stone cold killers.For sure there are mobsters that can do both things but are few in this days.
They need both, look at the 'ndrangheta they have polticians,bank managers, lawyers, but also a military wing.
You can pay a military wing without people that make money its the same story like NCO that had thousands of killers but lost the war because in 1983 doesnt have the money to pay them.
