Board Thread:General Mega Man Discussion/@comment-4452849-20140823161740/@comment-28265317-20160904212057

Aeolus wanted to extinct life, with only him standing.

Atlas wanted to make an eternal war for people to evolve

Thetis wanted to kill every human being, giving space to animals to live without interference.

I believe Siarnaq only wanted power to destroy whoever betrayed him. If he didn't do that yet with the power of Model P, I believe he only wanted to impose fear over the world population.