Perhaps some facets of libertarianism are really fucked up?
Slavery and child porn are debated by libertarians because the only way to address both is centralized government. However, since most (though not all) libertarians are opposed to any central government, they end up justifying with “well if you want to sell yourself as a slave, why should anyone stop you?”.
But yeah, obviously it’s us that are aware of this who are the fucked up ones.