"its not possible to have peace in northern Ireland" do you agree? @help on this question@. some starters for the introduction. some points?

No , but it's always difficult to achieve. You can't keep everyone pleased at once. Peace has been achieved largely by pandering to Loyalist extremists who are actually the real aggressive side. The prospect of some possible Nationalist rule would certainly be met by Loyalist violence,or at least the threat of it, as it was before WWI and during the Troubles (which was actually started by Loyalists in the mid 1960s, not by Republicans in the late 1960s as the official spin would have us believe).

The only way to keep NI peaceful is to convince Nationalists that they are both stakeholders in NI but also have their sense of identity as Irish rather than British respected.

But that is never going to be accepted unanimously by all within that community or by all within wider Irish Republicanism. Therefore to some degree tensions are always never far from the surface. Most however prefer peace above all. Therefore peace wins most of time.