A man can be ambitious without killing and conquering anyone.
A man, yes. Not an Augment. They are a different breed altogether. The drive to conquer and kill is built into them.
And let's face it, we've all seen what Khan is like (both versions). Does that sound like somebody who doesn't
want to conquer and kill? He can go on and on about all this 'revenge' crap, but in the end, he does it because he likes it.