The X-Men are a big tent of people with various backgrounds who have different ways of thinking and seeing the world. The philosophical differences between x-characters I have always felt feeds the overall narrative and gives spice to the relationships between characters.
The highest ideals of super heroes I believe are inconsistent with certain views and actions. Mutant nationalism and mutant separatism is not the idealized super hero thinking. It may be the right choice for a certain time and set of events, but its not the heroic ideal. The same can be said for using deadly force electively and I would define elective as anything short of no other option leads to immediate death to yourself or others.
Which x-characters function best as representing the highest ideals of super heroes and which do not?