The following contains spoilers for X-Men #11, now on sale from Marvel Comics

Thanks to her Omega-Level mutant abilities and her former status as a host to the Phoenix Force, Jean Grey is rightfully considered one of Marvel's most powerful figures. She wants to use that power for good though as a member of the X-Men and her ambitions to save lives are starting to expand to the rest of the Marvel Universe.

X-Men #11 (by Gerry Duggan, Pepe Larraz, Marte Gracia, and VC's Clayton Cowles) revealed that Jean Grey has very specific fury for those that would destroy worlds. A point which suggests she's still trying to make up for the crimes of the Phoenix.

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X-Men Jean Grey Gameworld Fight 2

The current X-Men series has introduced a number of threats to Krakoa, largely stemming from the human conspiracy Orchis. But there's been a series of intergalactic threats as well, stemming largely from the machinations of Cordyceps Jones. A mysterious and boisterous alien power broker, Jones has made his intentions to claim the Earth and has promised absurd wealth to anyone who can clear the world of humanity and mutants alike. Finally, growing tired of the constant assaults, four of the X-Men: Jean Grey, Polaris, Rogue (who got information about Gameworld from Rocket Raccoon), and Wolverine visited his intergalactic Gameworld to try and shut everything down.

While the group as a whole seemed committed to the mission, Jean was specifically concerned with how the Gameworld operated. The Gameworld destroyed planets for laughs, allowing aliens to wager for the fate of entire worlds. As she made her way across the intergalactic casino, she was particularly angry when she witnessed a young world full of resources be destroyed on a whim. She noted to herself that she'll "never again" let this sort of thing happen. When Jean confronted the gamblers, her demeanor was colder than usual and she quickly crushed a man's hand when he tried to insult her. Jean takes the destruction of planets seriously and given her history, that's a fair line to draw.

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X-Men Jean Grey Gameworld Fight 3

While retcons have placed the blame more on the Phoenix Force than Jean herself, the founding member of the X-Men has long held onto the guilt over what was carried out in her name in the "Dark Phoenix Saga." Consumed by rage and a need for power, a version of Dark Phoenix (a corrupted copy of Jean created by the Phoenix Force) ended up destroying a star, causing it to go supernova and take out an entire planet. In the process, entire races died in horror and Jean has held that fact over her head for years, with her time-displaced version even going on cosmic trial over the crime. The Marvel Universe has been wary of the Phoenix Force ever since, especially as it destroyed plenty of other worlds in the build-up to Avengers vs. X-Men.

Jean has been connected to the deaths of countless lives because of these events, so having her be openly disgusted with the Gameworld makes a perfect kind of sense. Jean has been incredibly empathetic since her return ahead of the creation of Krakoa, but has not shied away from observing the cost of the mutant's actions.

Her ultimate decision to leave the Quiet Council to help reform the X-Men speaks to her commitment to protecting lives over commanding them and her quick anger over the senseless loss of life, even when compared to other heroes, is striking. As the X-Men continue to expand into the greater universe, it's a good idea to give them clear views on the galaxy as a whole. Jean empathizing as a protector of every planet she finds is a good way to try and make up for some of the damage the Phoenix has brought to creation.