look at it this way, they claim to be all about being against initiating force against other people but yet favor things which allow corporations/other non-governmental groups to be able to initiate as much force as they want against the population without any restrictions.
What are some ways companies use force against the population?
The State does it: things are arranged so that all productive resources are 'owned' by a tiny minority. The majority is thus prevented from access to sustenance unless this minority allows it, which they do, typically, in exchange for the labour of the serf.
The essential source of their power to order the serf about is, clearly, due to the force that the State exerts, and has always exerted, upon their behalf. If any serf tries to revolt, he is placed in prison or killed. Many libertarians have difficulty understanding all this because they have a complete lack of a sense of historical context, and assume that the status quo of inequality of access to State power is 'natural'.