Knowledge is power.
In the past I have done this for my friends. But we should be careful in doing so as sometimes we may not be appreciated by them and may have to face their harsh behaviour too. They may speak anything in anger so we must be prepared for that also. There are all sort of people in this world , we should not feel bad for whatever they say and forgive them as they are our friend.
" The two most important days in your life are the day when you are born and the day you find out why? "
– Mark Twain
But if it is within your capacity to help patch up the difference between the two people, you should do it to bring both closer to each other. It is the responsibility of a person to become socially active and help people develop better relationships in a community.
Harmony will evolve if people encourage positive relations and friendly atmosphere between people.
Therefore, it is better to intervene to clear the misunderstanding between two friends and help them become better friends again.