This is a stereotype. The International community and different international conventions have addressed the problems of minorities in different parts of the world.
1) A demand for independant Scottland is not made by muslims. 2) A demand for separate Tamil Ealam is not made by Muslims. 3) A demand to for a separate land my the mizo/naga xyz is not placed by the muslims. 4) East Timor was a part of Indonesia but because it has majority christan population they got themselves another country. 5) Irish are still fighting the british to get freedom.
These are all political issues and as you can see all these issues have taken violent forms at some point or the other. All these issues involved people from all the communities. It wrong to see political problems as religious problems.