I honestly agree with the virtues
I know what your think 'THEY ONLY SEE THE HOLDERS AS VESSELS' abd 'THERE THE REASON ALL THIS HAPPENED' and I agree with the second one, but let's consider what I'm going to say right now:
The light of happiness was the only one hesitant to go with the light of solidarities plan. And it's split, the light of passion was one of the only souljams to help hollyberry cookie with her trauma. And let's also not forget what the virtues purpose were. The light of knowledge purpose was to be a distributor of knowledge to cookiw kind, the light of volition purpose was to grant wishes a give purpose to others, change purpose was to oversee creation, and solidarity was to simply protect the weak and be the ground for morality. Knowledge, volition, change, and solidarity somewhat didn't get to experience cookie kind and connect with them cause of their purpose wasn't connected to that. I think the light of solidarity knew they had to protect cookies and knew the beast doings were wrong, but was only fighting against them because they knew it was wrong at first.
While happiness was to nurture and ease the burdens of cookie kind, meaning they were the only virtue to experience connection with cookies. So it makes sense the other virtues wouldn't entirely see the holders as anything but vessels since they're purpose got in the way of connecting with them and cookie kind
And they had a point to keep the truth a secret because I think before shadow milk cookie and the other beasts found out the truth, the reason he didn't go after the witches was because the implication of them sealing them away ment they were still watching them, he still had some trust and loyalty to them, explaining why he barely talked about them in act 1. But once the truth came out, he probably lost all loyalty and trust of the witches since they did absolutely nothing and didn't care what they did, so it makes sense he's talking about them more in act 2.
So in conclusion, if we have to blame anyone for acts one and two, it's the witches and dark enchantress cookie