Evita, Michael was saying that the reporters on the Corleones' payroll would love a story about how a dead, crooked Mac (killed by Michael) got what was coming to him. I'm saying that they'd love even more to have the opportunity to expose a live, crooked cop mixed up with drugs and murder because, when the Police Commissioner fired, suspended or transferred Mac, they could brag that they did a "civic duty" by "exposing corruption."