There are two dynamics to keep in mind here.
One is that the bourgeois state has more contingencies that it depends on than localized egalitarian collectives do. Capitalism isn't some latent universal law that resurfaces as soon as you're no longer stamping it out. It's a historical process; it came from somewhere; it was ushered into being with great amounts of force. It would take a great amount of force to reimpose it (and in 1991, it did take just that). To get rid of the landlord class, though, all a government needs to do is arm the working people and pledge not to prosecute violence against landlords.
The other is that there's a bit of a cost-benefit analysis that needs to be done in order to subjugate a putative free territory. There's a certain amount of resources or revenue that could be extracted from the territory. If the attempt to being it back under the yoke of capital was projected to cost more than that amount, there would be no material driving force to get it done. Capitalist entities have enough trouble already balancing 10-year prospects against quarterly prospects. Granted, though, this means that anarchist approaches would most easily work in less-developed, less-contested places.
The colossus is not something that categorically hates you, it is something that sees you as a threat to itself and also wants to exploit you.
So for the case of counter-revolutionaries, all flesh is grass, they bleed as easily as any plebeian does. For the case of "fighting to defend the revolution", I'd be interested to see a concrete example of what that would look like, situationally.