
The resulting movie has only the bare minimum in common with the Infinity Gauntlet storyline that inspired it, but that’s not a problem.

Instead, the MCU’s Thanos is motivated by a misguided approach to sustainability, believing that only by slaughtering half of all life in the universe can the rest of that life be preserved. That motivation would’ve felt out of place in the MCU’s (at the time) more grounded approach to superheroes. In the comics, Thanos is madly in love with the physical manifestation of Death and slaughters half of all life in the universe to try and earn her favor.

The Marvel Cinematic Universe’s Thanos ( Josh Brolin) is an excellent example of this. But they can reinvent an existing character to suit the story being told in the adaptation. For example, there are instances of Batman killing throughout the comic book canon, but a story about a Batman that kills is always contentious despite that precedent.

The advantage of not being beholden to a single sacred text is not a free pass for comic book adaptations to do whatever they want with the source material.
