re:transcendingaudio

This honestly might be the easiest one to defend.

Yes, killing Aradia was A Bad Move.

Let's take a look at what happens leading up to that moment, shall we?

This is a bit after Vriska throws dear old Tavros off a cliff, and Aradia is seeking revenge. She summons the spirits of the dead to torment Vriska in an attempt to get her to feel remorse. [A successful attempt, as evinced by the art on pg. 2243]

Then, at what is possibly Vriska's lowest moment, Old Scratch comes a-knockin'.

To make a long explan8tion short, it's made pretty clear by the conversation on pg. 2244 that Doc Scratch essentially grooms Vriska into taking this course of action. He can say all he wants about how he's not "making her" do anything, (which, to be clear, is just another of his tactics to guilt her) but it's patently obvious that she never would've taken such drastic revenge if not for Scratch's influence.

I admittedly should have mentioned this note in my response to the whole throwing Tavros off a cliff thing, because the same idea applies there too.

"It's already evident that Doc Scratch has been manipulating circumstances to help this gruesome series of events unfold. He's always there at the right moment to nudge people in the direction of doing the nasty thing that, deep down, they already know they want to do. Like any self-respecting devil figure would. A couple pages ago, you might have noticed Terezi and Aradia alluding to his presence, when Tavros was in the process of jumping off the cliff. He asked them for help, but they didn't answer. The reason apparently was that Doc was distracting them, to ensure Vriska had the time to get the job done. It also seems likely he egged her on too, given what he's saying to her here. Maybe he'd been inflaming her contempt for Tavros leading up to that moment as well? Whispering things in her ear about what a loser he is, how he'll never become strong without her "help." He'd surely know just what buttons to push."-Andrew Hussie, pg. 2244 Author's Note