[occamrazor]

You walk into a store, take an apple and walk out of the door without paying. The police stop you and threaten you to forcefully deprive you of your freedom, unless you give money to the shop owner.

Would you call this robbery too? It seems to fit your definition.

[pitaj]

No. He would say that the stealing is the initiation of force so use of force in retaliation is justified.

[occamrazor]

Yes, but no violence, or even force, is used by the thief in this example.