In the post proposing the Pact, I wrote
The pact would start with members of the three varieties of Christianity affirming their right to disagree with one another, both in the sense of holding different convictions and of speaking publicly against the errors of the other parties.
This point needs clarification. Here are some situations I had in mind when writing these words:
Sometimes I write Orthosphere posts on Christian doctrine which require me to teach explicitly Protestant doctrine. I don’t do this to get Catholic readers hot under the collar (although some react that way). I do it to express my convictions. Another type of Christian who recognizes my right to do this will not see me as breaking fellowship. I have a right to disagree with my brothers in Christ.
Sometimes others speak against Protestant doctrine. I will not refrain from defending doctrines I believe to be true out of a desire not to hurt the alliance, because to refrain from defending my convictions hurts my spirit. But I will speak respectfully, for my interlocutor may be my brother in Christ, or at least my brother in Christendom broadly defined. My goal is not to harm, but to correct false doctrine.
It all depends on the spirit in which it is done. It could be a spirit of aggression, or a spirit of truth.