Egalitarian and political unity is not necessarily a good thing for the sake of the gospel. So often we see people compromising the gospel for the sake of confronting some moral or political issue. Some will defend their favorite talk show host for political reasons even though the host is not even a Christian.
We have been attacked by Christians who were protesting an abortion clinic simply because we were preaching the gospel, which some of the Catholics and Mormons present were not happy with. They argued that we needed to put aside our "doctrinal differences" for the sake of the abortion issue. The problem is that as soon as one starts going down compromise lane it is not long before we cannot talk about repentance and turning to Jesus because someone in a long list will be offended. Jewish talk show hosts play the Christian audience knowing that as long as they only address moral issues we can all get along. Peter, at the Day of Pentecost certainly did not buy into this egalitarian notion. His audience was likely all Jews and he confronted them head on and called them to repentance. He could have been politically correct for the sake of unity with the Roman and Jewish authorities but he didn't. Elevating ones denomination or political stance over the gospel is a recipe for disaster. Many will be on your side in private but in the public market place they will avoid you because they are terrified you are going to say something that is going to offend their Mormon neighbors or business companions, and that will not be good for business. People who are married to unbelievers are particularly prone to caving in to this kind of pressure because they have to live with someone who is going to make things difficult for them at home. So let's just talk about Mary had a little lamb and we can all be happy.