Sonny: "So why don't we just blast whoever's in the goddamn car?"
Clemenza: "Too dangerous - they'd be lookin' for that."

What does that mean? Who'd be lookin' for that?

Hagen adds: "Sollozzo might not even be in the car, Sonny!"

Well, he was in the car. Wouldn't things have gone a lot easier if the had followed Sonny's idea at that point? (Except for the fact that the story would have ended then...