Even the most well meaning anarchists do not have credible plans for how to successfully overthrow the government or how to organize society effectively should they somehow succeed in smashing the state. I say this as someone who has participated in anti-facist groups in the past. In my brief European experience participating with anti-facist groups, we would mostly go home, have a beer or two and call it a day after a long day of throwing rocks at neo-Nazis, with most of the structures we opposed intact the next morning.