Vi And Powder Were Just Kids Trying To Save Their Dad In Whatever Way They Could - Tumblr Posts

I think you are overlooking this sequence:

This is Powder realizing the cause of the explosion — flashback and everything — because the crystals happened to spill out of her bag and suffer enough impact to produce lightning effect but not enough to blow up in her face.

If Powder herself didn't connect the dots until that point, how could Vi? Why would she assume it's a dangerous explosive and not just some flashy jewels they could peddle for a good price when everything's settled down?

I mean, gadgetry aside, leaving explosive materials in the hands of someone who has already caused an accident with them once before would've been the height of idiocy and not at all Vi's style. She's been shown to have a good head on her shoulders, besides occasional impulsivity.

Can we talk about the fact Vi is also partly at fault for Vanders, Mylos and Claggors death just as much as Jinx?

Powder WANTED to give the crystals to Vander, but no Vi wanted to prove herself and let a child keep dangerous crystals! Especially a child who likes to make gagets!

Vi knew the crystals are dangerous, and so did Powder, but Powder listend to her sister because she admires her and trusts her, while yes she was old enough to know better, Powder trusted Vi, she was her only family.