You can't enslave people and make them act against their nature without a central government
Uh, of course you can. Slave owners of yore relied on paid guards and bounty hunters to keep their slaves. Sure, they were legally protected by the state, but they didn't need its actual interference. In fact, even after the importation of slaves from Africa was illegalized in the US, thousands continued to be imported just because the ban wasn't enforced.
There's also the hundreds or thousands of women who are forced to marry in their teens by their own parents and husbands-to-be, without the government doing anything except letting it be. It's a major problem in India, Pakistan and even in Britain.
Uh, of course you can. Slave owners of yore relied on paid guards and bounty hunters to keep their slaves. Sure, they were legally protected by the state, but they didn't need its actual interference. In fact, even after the importation of slaves from Africa was illegalized in the US, thousands continued to be imported just because the ban wasn't enforced.
Even in modern times and in countries were slavery was abolished, this is still true. For example, the Brazilian government had to free 4500 slaves just in 2008: http://www.guardian.co.uk/world/2009/jan/03/brazil-slavery-p...
There's also the hundreds or thousands of women who are forced to marry in their teens by their own parents and husbands-to-be, without the government doing anything except letting it be. It's a major problem in India, Pakistan and even in Britain.