I was really just making the quote. But since you borugh it up...

Was it really Frankies fault? Once again I blame Michael for Pentangeli turning on him. Michael basically brought it on himself ( see my reasons in my original post above.)

And Michael literally brushed Frankie off : "Let him go back to New York -- I've already made my plans. That old man had too much wine."

That line indicates to me that Michael did not respect Pentangelli like he should have. It was indicative of how Michael no longer considered those who were around him from the begining, and stood loyal to him, to be of any importance in being part of his quest for legitimacy!

As Turnbull so brilliantly pointed out, "It was, in effect, another example of Michael's struggle to bridge two worlds--the estates of Nevada and the streets of New York."

Michael did not want the old school people like Pentangeli around to "embarass" him. Michael fooled himself into believing that surrounding himslef with the new "society" people made him less of a gangster and more of a businessman.

Maybe he was really the one that was being nieve.