Curate, connect, and discover
in the movie gojo says "no one is allowed to take the youth away from kids. no one is." and i think that's very telling of how solidified his resolve has finally become because once geto crossed that line, gojo couldn't let him live. at the end of the movie, geto likely would have died anyway from his wounds, but his death wasn't guaranteed. gojo could have technically turned a blind eye the way he'd done with geto's past crimes. he could have let him go and framed it as an escape. or he could have waited for him to die on his own in the alleyway, but in the end gojo chose to kill geto himself.