To establish an effective argument, it's important to eliminate emotions.
Pointing fingers, creating issues, and demonstrating power will likely take credit away from your argument, as these techniques are all largely intimidation tactics. On the other hand, by eliminating emotions, you can focus on the facts of the argument, which will establish more credibility.
He would have left his legacy/ he would have denied with evidence everything that had been raised against him/He would have added more details on his mysterious life. These are some examples I can think of.
D because if the kept migrating they would die bc of harsh winters