A state of their own

MusiCal wonders why people are willing to fight for "a state of their own":

What's this thing about separate states? What am I missing? Why can't you share a state with other (different?) people?

Well, you can - if they respect you and treat you equally, and if your interests are properly taken into account. But where that doesn't happen - where the law is unequal, where you are treated as a conquered people "in your own land", or where your local concerns are essentially ignored by central government, then running things yourself begins to look appealing.

Most separatist campaigns are driven by perceived injustice. Remove the injustice, and separatism becomes unnecessary.