Another similarity, they both had their regrets for hypocritical acts. But he takes it at face value. And Vegeta's made it very obvious that he's learned sometimes letting an enemy live could be to his benefit.

"All that sounds real familiar." He's thinking again of the Kree. "Except less family drama an' the Kree eventually got beat out. Sounds like a forced treaty weren't gonna happen. Ya actually had to take 'im and his kin out to settle things."

Sometimes you gotta do what you gotta do. And the best option, if not the only option, was outright killing.