Err.. I hate to break it to you, but the Chan trolling culture has been used a a deliberate way of pushing extreme views into the mainstream for a long time now.

Look no further than Pizzagate and now QAnon. Boogaloo may have started out like that but people quickly made it a real thing long before mainstream media jumped on board.

The whole "oh it's only trolling, can't you take a joke" is just a front used for people to shield their true beliefs behind.

Here's a criminal charge[1] against one Boogaloo person. I'd note this sentence: "During the rally LYNAM stated their group was not for joking around"

[1] http://www.seditionists.com/parshall_complaint.pdf