Dr. Strange villian's the sorcerer Kaecilius actually makes sense. It is the same thing as Thanos (he hates pain and suffering thus he likes death for it stops pain and suffering, it is a mercy) but it actually makes sense in a way thinking everything that is deathless will stop pain. Of course it is wrong.
But yeah Thanos is just a bad version of the Illiad and the Illiad does a wonderful job of explaining the silliness of his logic. Harmony and Strife may cause pain but it also causes change and a new status quo that can be better than the old. Harmony and Strife are linked but also each other's counterpoints, and they work together to cause advancement like a crimson bow and arrow (see Greek Philosopher Hera****us who is heavily inspired / summarizes up Homer's Illiad, but also see Attack's on Titans first opening Guren no Yumiya / which means Crimson Bow and Arrow.).