Board Thread:Metal Gear Solid V/@comment-111.68.57.191-20150203142753/@comment-86.1.87.116-20150212125958

"Butterflies
 The Japanese view butterflies as souls of the living and the dead. They are considered symbols of joy and longevity. " - SOURCE:  http://www.cherryblossom.co.nz/Articles+of+Interest/Symbology.html

I guess it just reinforces the idea of peace?