Yes, Michael was at his most manipulative right after the Tahoe shooting. After practically reducing Tom to tears with that "you're my brother" BS, he worked over Pentangeli by screaming at him ("...in my bedroom...where my wife sleeps...where my children play with their toys..."), then, when he tells Frankie, "I want you to help me take my revenge," Frankie practically collapses with relief. "Michael, anything." Bingo: Michael says, "Settle these problems with the Rosatos." He asked Frankie to meet with his hated enemies--put his head in the lion's mouth. If he settled up, so much the better for Michael--one less problem. If the Rosatos killed him or tried, more proof that Roth was behind the Tahoe shooting. Michael couldn't lose, Frankie couldn't wine.