Let me put a scenario in front of your eyes. It's one that goes on every day all around the world. For the nonce, I will not allude to the morality of this scenario. Until I've presented it, I will leave all conclusions to you, the reader.
On with the story.
One evening you decide to go for a walk. The idiot box is boring, you have no real plans for the following day, and just feel like taking the night air.
After you've been walking for a few blocks, a man steps in front of you, points a weapon at you and tells you to put your hands where he can see them.
As he has the drop on you, and you are not armed, you comply. He then binds your hands and takes you away and locks you in a small room where he states you won't be leaving until someone pays his price. He allows you to make a call for help in meeting his conditions, but only with him listening in and censoring what you might say.
You don't know this man. You've never seen him before. You have no reason to believe he has any grievance against you.
How would you describe this scenario?
I would call it kidnapping. I would further define it as grossly immoral. I would, in fact, say that you would be entirely justified in using any means or force that you could muster to escape this situation up to and including killing your assailant.
Would you agree?
Think about it for a minute. You've been kidnapped and held for ransom. Isn't it your human duty to escape by whatever means you can? ...
And now, we'll add one more element to the story. The man in question wears a blue uniform.
Do you still think you're correct in trying to escape at any cost?
In normal human interactions, murder, kidnapping, theft, and other open aggressions are taken to be criminal acts.
The primary difference between a collectivist and an anarchist is that we hold the State to the same standard and therefor find it unfit to exist.