... something like that.
Mostly GIs that came back from WW2 and were looking for excitement... one of these small "gangs" was the "****** Off Bastards of Bloomington" and they had a run to Hollister (which is why Hollister is famous... mostly from
THIS picture, which was faked. The guy that really owned that bike, not the guy in the picture, has been suing the magazine since the first time that picture appeared in 1948) that got nation wide media coverage (even though the "RIOT" was mostly drunken locals and was done with the blessing of the local police, that blocked off the streets for bike races, and ... drunken riots), then to cash in on the "biker" mania: they made the movie "The Wild One" with James Dean... and EVERYBODY wanted to be
James Dean...(HE'S SO DREAMY) and a couple of years later, we get Hell's Angels from the ashes of the "bastards" club.... then the "bastards" got back together.....
In response to the "Hollister Riot" the president of the American Motorcycle Assn. said that 99% of motorcyclists are law abiding people, and 1% are NOT... so bikers are "1% ers".
Sonny Barger, the long time US National HA president, when asked if he had regrets, didn't mention the violence or murders, the human trafficking or the drug dealing that ruined millions of lives, or the racism or the antisemitism... said that he regretted being Harley centric "Honda makes a pretty good bike".
... so from where I sit: it's MOSTLY cosplay, right from the beginning.
One of the oldest and longest lasting "biker"gangs is the Booze Fighters (The owner of the bike in the picture above was a Booze Fighter). They predate the Hells by a couple of years Started by the life time president Wino Willie.They raced bikes and got drunk... not necessarily in that order... That's cosplay I could get in to.