I agree completely, but you need to understand cardinally, what the fundamental essence of the constructs of the ideas of ownership and theft are, which I've outlined twice I believe, in this thread.
If ownership is arbitrary - thus, it is whatever a ruling class stipulates, then theft is arbitrary. I, as the ruler, can simply tell you what ownership is, so I can take from you, say you didn't own it, then declare that what I did is not theft. The state already does this universally throughout the world today in the form of taxation.
But that is a semantics problem, not an ideas problem. Theft and ownership remain only what they CAN be logically, not what someone arbitrarily thinks they are. You cannot own that in which is stolen and you cannot steal that in which you own. To own, you require two fundamental criteria: Desire to own, and that you have not engaged in any actions of which violated the will of another within a logical order of operations as pertaining to that thing.
Theft is any act of which violates the will of another as it pertains to property.
In short, if I desire to own a thing nobody else desires, I own it. If you come along and want it and I do not want to give it to you, you have to rob me in order to get it. There is no alternative. Saying you deserve it more because of X, Y, or Z is irrelevant. Even if I own 10,000 years of food for example and you're starving, this does not mean to stole your food and you're just taking it back.
So if you're going to make a claim of theft, you have to be able to both support it logically, AND support it with evidence. For example, how is Walmart stealing from you? Because it won't give you the deal you want if you were to seek consensual employment? That isn't theft.
If I have food and I want $100 for it and you want me to give it to you for $10 I'm not robbing you. You don't get my property without my consent. I have to either agree to gift it to you, sell/trade it to you, or throw it away so I no longer want it whereas you claim it after. Anything other means of which you obtain exclusive authority over my property is theft.