Because that is the whole point of anarchism. No initiation of force.
...snip...
So there won't be any violence in an anarchist society ?
Is there supposed to be violence? No.
And yet again, I fail to see how this relates to anarchy - it's an issue with practically any system in existence.
Its an issue if you propose a system that allows people to form private armies and they decide to take you as a slave. If you have allowed them to form an army and there is no state, all you are left with by way of defence is saying "Is there supposed to be violence? No."
That's a very poor alternative to democracy.
Because that is the whole point of anarchism. No initiation of force.
[...]
EDIT: Also, what is there in the current system to prevent people from forming private armies? Oh, wait....
The present system prevents military grade weapons getting into private hands. Try buying a combat aircraft or a tank or SAM tomorrow.
Do you want to replace that with anarchy and then count on the bad guys not initiating force.