Fundamentally, most all of us, regardless the size of our respective spheres of influence, seek to dominate, seek to establish our wills as supreme within that sphere.
Friends share a common interest, appreciation, or bond that ties them together; the depth and strength of this bond is only as strong or as deep as the tie which holds them together.
It’s not as though what others do or do not do becomes unimportant, or even justifiable; instead, it’s a matter of framing their omissions or commissions in the light of their sufferings.