I will answer with the wisdom of the bible.
Ecclesiastes 4:12
New Living Translation (NLT)
12 A person standing alone can be attacked and defeated, but two can stand back-to-back and conquer. Three are even better, for a triple-braided cord is not easily broken.
A person standing alone attracts less attention... two standing back to back can be dropped with one bullet... a three person braided cord warrant a frag grenade.