Freedom means you get to pick the rules; they can't be imposed on you by others. The thing is, you can't pick one set of rules for yourself and a different set for everyone else. Whatever rules you choose to live by must apply equally to everyone. Don't like private property? Fine, but you can't object when others retaliate by seizing the fruits of your labor. Think kidnapping for ransom is harmless fun? Locking you up in prison is essentially the same thing.

The problem is when certain people want others to live by their rules and are willing to apply disproportionate force to get their way. Capital punishment for theft, fines and imprisonment for copyright infringement, penalties for refusing to aid an official investigation, etc.