Without a state to enforce environmental regulations, how do you intend to defend your community from pollution? By attacking the polluters with guns? They have guns, too. Probably more guns than you do, since pollution is so profitable.

Without a state to defend against invasion, what's going to stop some other country from marching in and enslaving you? Small arms won't protect you from a modern military; only a modern military of your own will, and without a state, who will command it?

Without a state to enforce mutual aid, what's going to stop others from withholding it while taking yours? By the expectation that no one will be so greedy as to withhold needed aid? Then your proposed system will fail almost immediately. By some sort of aid credit that groups of people exchange equally in order to ensure that aid given equals aid received? Congratulations, you have invented capitalism.

The state apparatus exists for a reason. It has of course been abused, but we can't simply get rid of it and expect everything to be fine, or else we'd have already gotten rid of it a long time ago.