You know their violent participation in BLM protests is a  ironic catch-22 for the BLM movement. How can you police participants in a protest if the protest is against policing itself? Convince them of the benefits of non-violence by talking it out?  These guys don't want to talk, they want to see action against police. To them live protesting is not about talking, They already talked it all out online, they know what they want: war with cops, get rid of cops. Live protests against police are a chance to rile people up further, get some action going in the war against cops.

Edit to add: and especially federal cops, that's where there's the similarity with McVeigh: anti Federal government in general. And this is where the radical claims of official BLM manifestoes ring hollow as being aligned with the Democratic party, they are not.  Nor are those who focus on attacking Dem mayors of big cities. Take away the name tags and what you are dealing with across the board is attack on "big government". This is why the few true libertarians who have roles in big government, like Justin Amash, are very sympathetic to many official BLM policy ideas. They are not vanilla left ideas, they are radical libertarian anti-big-government ideas, i.e., let the people help themselves in local loose organizations, let them protect themselves with their own guns, etc.

It's no coincidence that groups like the diehard Portland protesters never mention Trump or Republicans  Their beef is with any Dem who would support a big government including an FBI and a Homeland Security Dept. and not to mention an FDA that tells you what drugs you can take and what food you can eat.

you can't explain this away like that as just another plot by those who wish to maintain white supremacy, just the opposite, extremist libertarian impulses have always been a persistent minority strain in this country even before it was a country, it's part of the fabric of our culture, cf.

...McVeigh was hoping to deliver a blow to the government so forceful that it would bring it to its knees and ensure another Waco would never happen. In the days leading up to the bombing, McVeigh was said to have warned his sister of a coming revolution against the federal government....

has little to do with organized anything much less organized political parties. Think New Hampshire or Wyoming, Gadsden flag...

Yes, these people do have some commonalities with John Brown if that's what you're thinking about.