I mean, honestly, if you really want to solidify the appearance of "not being a threat" this definitely works well. The problem is that the machine of state violence under fascism does not give a fuck. Non peaceful protest only works when the government has some care in the public response. It is useless if there is not an audience with power to convince of the injustice. Just ask the Palestinians during the Great March of Return (or countless other peaceful means of resistance throughout their history). No one with power gave a single fuck.

Dr. King’s policy was that nonviolence would achieve the gains … His major assumption was that if you are nonviolent, if you suffer, your opponent will see your suffering and will be moved to change his heart. That’s very good. He only made one fallacious assumption: In order for nonviolence to work, your opponent must have a conscience. The United States has none. - Stokely Carmichael

Waiting for the CIA to do a false flag event in one of these outfits to ban costumes like this. But I don't think they care enough. They aren't afraid of a video of police beating the shit out of a dude in a costume. They already put pepper spray in the air intakes.

Americans need to drop the MLK mindset and go Black Panther Party right fucking now.

Non violence cannot be the only response to further violence.