I don't think the question is so much one of whether a tactic is right or wrong. There are enough examples of both made by ALL groups.
It's a question of who is making the decisions and running the show. A certain tactic might not seem wise to you or me, but then, we probably don't understand everything that went into that decision.
And secondly, it's ultimately not a popularity contest, nor is it a case where support for goals needs to be contingent on being part of the decision.
I'm not saying you were implying that ilha formosa, but non-FN support is not the central consideration here.