Spider-Man: No Way Home subtly sets up the major problem with the X-Men. Marvel Comics has always liked to imagine its stories take place in what Stan Lee called "the world outside your window" — albeit one with gods and monsters, aliens and mutants. The Marvel Cinematic Universe has followed the same kind of format, attempting to ground the various characters, from the Avengers to the Eternals, in the real world. That's led to some of the most interesting movies of all, as the political repercussions of the Sokovia Accords tore the Avengers apart in Captain America: Civil War.
Spider-Man is the only Avenger to date who has been a teenager in this shared universe. That's given his solo films a unique feel in the MCU, but it's also posed serious ethical questions about whether or not the Avengers should allow Spider-Man to join in with their superhero fights. It didn't take long for War Machine to pick up on this in Captain America: Civil War, with Tony Stark brushing the question of Spider-Man's age aside. "I don't know, I didn't carbon-date him," Iron Man defended himself. "He's on the young side." The question of Spider-Man's age surfaced again in Spider-Man: No Way Home, when Peter Parker's beloved Aunt May was accused of child endangerment because she had allowed him to act as a hero. "Child endangerment's a nasty rap," Agent Cleary accused her. "A boy was entrusted to you, and as his legal guardian — essentially his mother — you not only allowed him to endanger himself, but you actually encouraged it. Who does that?" It's true this was just a throwaway scene, and the ethical considerations weren't subsequently explored in greater depth — but the question is a chilling one nonetheless, and it has serious implications
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