AnCap is predicated on the concept that
no one has the right to initiate the use of force, threat of force, or fraud against a person or their property. People generally live this way naturally, and only governments inherently violate it. If people respect that, and those that don't are considered criminals, then society is peaceful.
For the more interesting subject.
We just disagree, without inflation, even without a proper state, there will still be poeple to sell weapon. If we stop to make war, this guy loose his job. So if i was him i would do whatever i can to stimulate fear or hate or greed.
Even without war, there will still be people to buy weapons. Personal defense, or running a defense company, you still need guns. No need to foment war to sell guns.
He is the most obvious but not the one who has the biggest intrest in war. Other reason i think make war very profitable is
1) Defending your communitarist values, communism for your author. (profit in this way is not just money)
If you are making war, you are by definition not defending anything. You can try to spread communism through violence, but this will not endear the people to you.
2) Stealing consumer that chooses a poor protection service. (generally the main reason)
Likewise, shooting the guards at someone's house and telling them that you are their protector now does not sound like a good way to make friends.
3) Showing that your protection service is the best. This can easily derivate in racket
This might be a reason one would engage in combat, but it would be rather pointless. You'd lose men in doing so, probably resulting in you not being the strongest anymore. Maybe a Laser tag battle. It could even be televised. Sport and advertisement in one.
4) Preventing any other outsider to arise by just killing them poeple don't even have to know you killed them.
Shooting visitors to your house is not a good way to invite other visitors. This is fine for an isolated place, but most like to trade with their neighbors, so killing potential trading partners... again, not a good way to make friends.
What is important is that poeple will always try to use the cheapest way to grant the greatest profit. Sometimes unfortunatly it is war. face it.
War is a great way to make profit. it's far from the cheapest.
Edit: Wow, never saw an entire post scratched out before...
Maybe the only question is, Do you really think that we need agency with gun to defend us, BUT nobody will try to team up to stole you with guns (unprofitable)?
Well, specialization is the best way to provide for a need, and I'll doubt you will argue that nobody will ever need protection from violence, so it just makes good economic sense to have some people whose job it is to protect people. I'm not saying that nobody will try and take over. It might even be one of those groups of people whose job it is to protect people. What I am saying is that when they do, they will correctly be viewed as criminals.