Slavery never left: they just call it democracy now. There's no way any private criminals could ever hope to attain the amount of wealth expropriation and exploitation that the State does. They're able to achieve this only because they've fooled public opinion into accepting precisely what it is you push: "the poor would be worse off" (as if they aren't now, under the biggest State ever, where the term "the 1%" was created); "warlords would take over" (as if they aren't the people in government right now, who can externalize their costs of aggression onto taxpayers); etc. 

Open your eyes. What do you think we have now. Look at the people who rule us.