Deluded yet understandable.

Somewhat understandable

Understandable, if completely impractical from a realistic perspective.

His philosophy is Malthusianism on a universal scale.

Honestly, I feel like half of Earth's population are just unrepentant sexual predators, corrupt law officials, domestic abusers, cyberbullies, murderers and "pranksters" who break the law for laughs and clout. So I personally wouldn't mind if Thanos snapped us out.

Pure evil hes a war lord

While flawed, it is understandable since he wants to prevent overpopulation.