The dwarves' fate in Avengers: Infinity War proves that Thanos (Josh Brolin) wasn't as noble as he claimed himself to be. Marvel Studios has introduced all kinds of bad guys throughout its 14-year history. However, easily one of its most unforgettable ones was the Mad Titan; not just because he handed the Avengers their first real defeat, but also because he wasn't motivated by greed. Instead, he was convinced of this misguided idea that for the universe to survive, he should kill half of its living population. It's essentially genocide, but he sold the concept in a way that some were convinced that he was doing the right thing.
Marvel Studios had been teasing the existence of the Mad Titan in the MCU as early as 2011's Thor. He made several appearances after that, but it wasn't until Avengers: Infinity War that he properly debuted. The move was risky, considering that directors Joe and Anthony Russo also had to juggle a massive cast on top of establishing him as a worthy adversary for the Avengers. The most interesting aspect of his characterization, however, was that Thanos believed that he was a hero. The filmmakers leaned on this idea to make a more interesting dynamic between the villain and the Avengers, but ultimately, Thanos wasn't simply misguided like Marvel Studios presented him to be.
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The Russos always emphasized that despite the Mad Titan's prowess, he never went out of his way to kill anyone. It's supposed to indicate that the snap wasn't personal; he wasn't collecting the Infinity Stones and going through with the decimation of half the universe just because he wanted to. He was consumed by his so-called «calling»—but the
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