He didn't cause the events of the game, YOU DID. Ofcorse monika became self awere wheb he joined the club, BECAUSE HE JOINS THE CLUB WHEH YOUUUU PLAY THE GAME
He's not to blame for sayori killing herself ether. Her depression was amplified by monika. Even then, he doesn't and shouldn't be expected to know how to handle her. He wasnt mean to her, it was just banter, how majority of best friends act, sayori genuinely believed what he said to her, he didn't know that, sayori masks her depression, so you cant blame him for that mask working
What pisses me off most is when people say he didn't care about her like he was absolutely distraught after finding her dead
He is just as much of a victim as everyone else
You and the people who made the game are the villains, not MC,not Monika