What would you tell Pete?

Why can't we get along?

My friend Pete (made up to protect those involved) helps out at some local missions.
He's a real peacmaker. Always trying to see from another's point of view. Always trying to bring people together to care for one another.

The problem? 

The people in charge of some of the missions can't get along.
Even though each is important, and each one works hand in hand to meet the needs of the community, they undermine eachother sometimes.

They talk to others in the community negatively about eachother.
Sometimes even saying things that aren't true or are based on bits of miscommunicated information, or jumbled up facts.

Pete, tried to talk to them. He had lengthy conversations with some, made several meetings. Each time he went he thought that things had been settled. He thought that everyone agreed that there's been some misunderstandings and that they would all try to work together.

But despite his efforts he heard today that one of the leaders, one that he thought for sure he had come to an understanging with, said some hurtful things about another mission to someone in the community.

This community member was excited and wanted to raise some awareness for several of the missions. She was met with some harsh words, however, from this leader about one of the missions she wanted to include.

Fortunately, she wasn't put off.
She knew of the good that this mission does, that all of them do every day, and the importance of working together.
My friend Pete is devasted though.
He really thought he had made some headway in bringing peace.

So what would you do in this situation?

Would you confront the leader and ask why they said such things?
Would you ignore it since it turned out fine in the end?