The X-Men have faced a more difficult time than any other superhero team. Not only have they had to deal with the common problems that superheroes have, like supervillains, but also that the governments of the world want them dead. Even the civilians the X-Men save often hate them, making being a member of the mutant team a very difficult proposition for the team's members.
Source:https://www.cbr.com/dark-xmen-decisions-marvel-comics/