Michael was right -- he's gonna kill Pop, that's it. That's the key for him. Gotta get Sollozzo
Where does it say that you can't kill a cop? -- if history has taught us anything -- it's that you can kill anybody.

Sollozo was right I am the hunted one!
I'm not that clever. Otherwise he frisk him when he came back not when he went, to the bathroom

McCluskey was wrong Ahh, he's a good kid.

Both were wrong No one was to die
To be fair they were under the impression, Corleone didn't know where the meeting was taking place

Tom was wrong Sollozzo was not invulnerable being guarded by New York Police captain