He have no problem cooperating with WG.
Xebec also corporated with the WG. Remember he struck a deal with them to get Pirate island under control
Teach genuinely wants to Destroy the WG too.
And no, none of these two Rocks or Teach are like Dragon. They both want to destroy them WG so they can become the New King of the world to replace Imu. Dragon does not want to do that. That’s what Dragon is a good guy and Teach is not
my guy, I’m not going to entertain your made up numbers. On top of the fact that Roger is stated to have destroyed an army, he’s also not even stated to have KILLED the army men. The strawhats destroyed the Beast pirates army yet as far as we know, almost everyone in the beast pirates the strawhats fought is still alive, including Kaido. So you can in fact “destroy an army” without killing everyone.
collective punishment is a specific term that means the murder or subjugation of civilians and unaffiliated parties.