a few years back, the suspect started posting on the train & camera boards, he had some catchphrase [ バリ バリ順光でサクッとバリ サク, basically take photos with direct sunlight and smth else], and he spammed his copypasta in the boards with his name as バリサク君, barisaku-kun, and he because pretty famous on the board because of it and it was like a meme basically

but there was another reason why the term barisaku was famous/popular
in kyoto animation's hibike euphonium, there was a scene in which a baritone saxophone does a solo was broadcasted.

and that scene was abbrieviated to barisaku. despite the term being used in music for ages barisaku-kun mistakenly thought that kyoto animation had ripped off his own personal catchphrase.

Hibike! Euphonium collaborated with keihan(train company) to have wrapping trains(trains with anime characters printed around the body) and as a result it drew many anime otaku to flock to the trains and take pictures, and the anime otaku did not have manners/etiquette which caused arguing between barisaku-kun and the weebs which added to his extreme rage towards them.

barisaku-kun trolled 2ch's anime board, by posting [because of hibike euphonium, my life has gone mad. absolutely unforgivable!] at every time of the day regardless of circumstance

https://m.imgur.com/CpZgVh6

one day, barisaku-kun's figure was erased(literal tn here because not sure if banned or he left by himself)

the next day, the fire at kyoani occured. the suspect, was screaming "you ripped me off".