I don't really understand. You have never been free to do whatever you like. If I walk in to the head office of some libertarian company and take a computer,

I don't really understand. You have never been free to do whatever you like. If I walk in to the head office of some libertarian company and take a computer, would I be free to leave? Would I be free to enter? There is an asymmetry between leaving and getting fired. If an employee leaving seriously damages a company it is kind of on the company. If an employee gets fired it can seriously affect their life, and that of their family.