Also to support the warmongering, you have the ABILITY to recruit volunteers. Miller evn says that kidnapping people might be heavy-handed. You do it anyway. That you, personally, as with the other things, imposing your will on others selfishly. These men doing a 9-5 that just want to get home. You kidnap them, brainwash them, and then send them out into the field after indoctrination. Sending them out on Outer Ops to fight and die, killing by default with no ability to even spare a single life.
MGS2 was Kojima attempting to build the legend of Solid Snake from an outside perspective. That's why there's things in the game like a copy of his XM9 being in the Big Shell, books being published about his exploits in the briefing files in the main menu, newspaper articles in the same menu, his name being used specifically for the shock value by Solidus until he's outed as an imposter, so on.
The repetition of the word "Peace" in Peace Walker was kind of heavy-handed, but it was intentional. It was supposed to be a stark contrast to when all of a sudden, the time when people were preoccupied with peace and an altruistic (virtuous) mission was over and the bloodbath began. Grinding, stealing, killing, doing jobs out of greed. I want what they have, I need bodies to send into the field, I need money and I'm willing to be hired by this nameless entity in exchange for money, so on.
You literally unlock a huge variety of missions, as you complete them, that have no names tied to them, no ideology, no greater purpose. Just a mission, a payday promised, and the enemy. you send your men out to fight and die, you go into the field, building up your armory, improving your facilities, recruiting your teams and seeking new talent and abilities, seeking to make a name for yourself and building your "heroism," your cult of personality that effects morale and recruiting. You're already a warmongerer. You did it. Not the character, you, the player.