>>719877681
The theme is very clear. War turns men into demons.
Venom carries the guilt of every thing that went wrong from MGS3 to MGSV.
Kaz became a hollow angry shell of himself.
Skullface became a faceless monster willing to torture and experiment on children to achieve his goal.
Volgin refuses to die becoming a being of pure fire and rage. When his revenge becomes pointless he burns out and dies.
Hell even one of your old soldiers (Mosquito) forms his own PMC and attacks you to get revenge because he blames you for the fall of motherbase.
Paz is the angel of the unachievable ideal of peace.

Venom genuinely being a good and caring person that saves children, animals and the world just adds to the tragedy. In the end Diamond Dogs are forced to become just another cog in the war machine.