It isn't so much an issue of "Extremes" IMHO. After all I'd say often any political project has outcomes one did not necessarily expect to happen, possibly even producing the opposite of what one might envision an action would cause. Reducing the State would produce a society, but not the society AnCaps expect. This may also go for AnComs (Anarcho-Communists) as well. There would still be society, rules, law and power but where that power rests would be different but familiar to anyone who studied the past to any great detail.
But I would say the tendency for things to pan out in unexpected ways can go to anyone's big project. This would include the much beloved Radical Alt-Centrists and eager Neo-Liberals/Conservatives.