I don't know. Vinnie has flashed a gun in from of MC's nose just because. That sets the general tone of the character as a fucking loose cannon. You can expect everything from him, including killing Quinn or any of the characters related with her business.
And there are paths that can lead to deep depression and suicide. For instance, imagine Sage when she discovers that her "daughter" and best friend Quinn has been running a drugs and prostitution ring in her sorority with half of the sisters, and under her nose... and with Sage's own father involved, no less! Her sorority and her own family falling down on her head. You add to that to having been fooled and used as a simple façade by fucking Chad for a long time and, maybe, MC don't telling her about it and/or fucking her own mother... Poor Sage has a free ticket for a trip in the Titanic and doesn't know.
I don't want to see it. In my main gameplay, that is Sage's, I'm not going to be even close to Jade and will never ever lie to her or keep information from her, just in case.
But my point is, this game can get really dark really easily, and that thing of Jill's warning at the beginning of the game is DPC getting for herself a "license for being an asshole with the player" and start killing characters at any moment.