Why Galilean moons, not Mars

In the pursuit of settling humans beyond Earth, wouldn't it be better to explore other worlds that are less hostile than Mars?

The past week has been bitter-sweet for space endeavours: While the European Space Agency’s Jupiter Icy Moons Explorer (JUICE) successfully blasted off on its mission to study Ganymede, Callisto, and Europa, three of Jupiter’s Galilean moons (except for the volcanic hotspot Io), SpaceX’s mighty rocket — the Starship Super Heavy — failed to make into the Earth’s orbit and exploded.

Both these projects are crucial in the quest for making Homo sapiens an interplanetary species. On one hand, JUICE would be looking for alien life on Jupiter’s moons, and on the other, Starship rockets are being developed to one day take