Again, you are confusing yourself.  The administration of a taxation system may be rubbish but its is still a taxation system.  Tax is taking legally; theft is taking illegally. 

I think what you are trying to say is that you don't like the idea of law and therefore all actions that are "legal" under the present system are outside the law for you.  Its a valid viewpoint but you can't use words like "theft" or "property" if you don't like the idea of law.  They are legal creations.