Well if you put 2 and 2 together, its for the simple fact that the guys that were killers are fucking dead now. The guys that are left ran rackets that were non violent.

How are you supposed to get anyone to kill anybody if in fact there is no one willing to do the job to begin with? Its not like you can teach a guy to do dirty work when he's 70 years old and has specialized in Unions his entire career. Killing and getting away with it takes skill and an individual who is mentally capable of carrying it out successfully. This has had a huge impact on what kind of rackets the mob is involved in today which are way more white collar than ever.

This is just my opinion.