DNA similarity would not prove a common ancestor. But the several thousand relics of past retro virus infections in specific individuals that were handed down to both it's primate and human descendants do.
This is the smoking gun that proves a common ancestor, equally well as OJ's guilt was proved by the DNA at the murder scene from the cut on his hand.
Interesting. Well, help me understand it.
If men and apes suffer from the same virus it proves men descended from apes?