You can't change human nature, only the conditions in which people act. You'll find that the mechanisms which are used to outlaw the ideas of authoritarians are precisely the means by which authoritarians gain systems which can be used to oppress others. You end up with Soviet Russia or Jacobite France, where the Stalins and Napoleans can take power. Libertarianism can only be achieved by abolishing the state through peaceful activity and obsolesence, so that when it does collapse (and they all do) there is an underlying libertarian society to replace it. I promote civil disobedience, defensive action, counter-economics, agorism, mutual aid societies, and technology as means to abolish the state and realize a more libertarian and egalitarian society. Proudhon called for similar methods like dual power , which consistent libertarian socialists support. 

"Libertarian socialists have more recently appropriated the term to refer to the nonviolent strategy of achieving a libertarian socialist economy and polity by means of incrementally establishing and then networking institutions of direct participatory democracy to contest the existing power structures of state and capitalism. This does not necessarily mean disengagement with existing institutions; for example, Yates McKee describes a dual-power approach as "forging alliances and supporting demands on existing institutions — elected officials, public agencies, universities, workplaces, banks, corporations, museums — while at the same time developing self-organized counter-institutions." In this context, the strategy itself is sometimes also referred to as "counterpower" to differentiate it from the term's Leninist origins."

Antifa just comes off as a bunch of Tankies trying to turn otherwise peaceful leftists toward authoritarian marxism-leninism. Not interested. 

It can't be abolished through peaceful means, because those in power are not going to willingly give it up. They are authoritarian for a reason: they like control. There's a reason they have a military and a police force: they need violence to sustain the system. Therefore, the only rid to get rid of it is through violence: you can't be peaceful against a violent opponent.