They are not theft, because a human does not have innate property rights(or any other kinds of rights for that matter). All your rights are provided and guaranteed by the state.
In the western society, people do have rights in fact, even if not granted formally by some government. This is because vast majority of other people respect those rights, without needing government to tell them. For example, most people accept my right to wear red shoes. Nobody really gave me that right; it is obvious. Similarly for the right to private ownership, the right to express myself and the right to move.
State != government. Also try putting brown shirt in Germany on whose shoulder there is red band with white circle. In which circle inside there is black painting in the shape of bent cross ... and we will see exactly what the western government of Germany thinks of your fashion choices and your freedom to express yourself. Hint - your right to move may be somewhat in peril.
By that reasoning, the state does not have an innate right or authority to provide or guarantee human rights.
And really, it's human's that guarantee the state's rights, not the other way around. The state is an abstract concept that exists only because humans gave it that right at some point.
