"If one is already against aggression, why does a "case" need to be made that it is good to avoid having an institutionalized source of aggressoin?"
A case needs to be made because in the real world, states are overwhelmingly preponderant. This is particularly so in industrialized societies, which have never to my knowledge had a functioning anarchy.
As to the state employing force, of course it does. Certain people are always going to be more inclined to force than others, and the state is a clever device for making them fight against one another--state versus mafia, state versus gangs, state versus terrorists. Without the state, those who incline toward force would perhaps join one of these other institutions. The state is a two-way check on violence, and that's another reason why I think it's worth keeping.
Your line of argument assumes that defense agencies or protection agencies under free-market anarchy would not themselves be institutionalized sources of aggession. Indeed, that they >i>could</i> not be institutionalized sources of aggression.
People who don't already agree with you are most unlikely to grant that assumption.
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