I taked the gun thing as " we don't talk brunisses over the breakfast table", as more Helen wanting a resemble of normalcy than a aversion to a gun or violence, Helen seems in the loop of the criminal activities of her family and if was something that she truly despised, Scarlett would not be as close as she is.I'm also intrigued by the guns thing. Willi mentions:
kat "Dad's in prison."
scene ad398 with dssa
d "They found his weapons stash?"
scene ad399 with dssa
kat "What weapons stash?"
d "...Nevermind."
Given how strict Helen is about guns, and Willi mentioning that what he did to the boys teasing Gina wasn't exactly legal, I'm guessing there's quite a history of pushing boundaries. Which makes the reason Willi left even more confusing. In the old WiaB, Leia was still a virgin until CH 6 from memory, so it'd be pretty hard to imagine someone being blackmailed over a kiss, when Willi's already creampied Monica with no consequences.
I guess again, they're making judgments from the perspective of their age - it's the importance they ascribe to an event, not how objectively significant the event is.
I like the ideia that William over reacted because he was young and stupid, but William at least was not a virgin anymore and Leia did not lose her with him so I don't think that the blackmailing was over their relationship exactly, at least not sex between the two, maybe Leia and William pushed a little too far their "pranks", Katie caught wind of it and blackmailed William or both over it. About the Mon incident, I get the impression that William fled not long after the Kat birthday, at least I don't have recollection of him being aware of the extension of Leia's bulling so maybe the lack of consequences for him was just that he no longer was there to suffer them