This conversation is hilarious.

Everyone's acting like they know, with exact detail, every bit of what happened between the end of our arc in Elpis and the Sundering. We don't. We don't know what Venat tried. WE just know that she was unable to convince people not to rely on Zodiark as if it was a panacea. That's all we know. We don't know how much info she tried to give them, or how little. We don't know what she told them and what she didn't. We don't know what she tried or what they did. We have none of that information.

But you're acting like she just... did nothing until it was time to go kill everyone. Without any actual indication that that was the case. And then you're taking your OWN BASELESS TIMELINE OF EVENTS and using that to make a judgement call about how you feel about the rest of the story.

For all you know, maybe she TRIED to tell people exactly what happened, and everyone was just like 'oh great, the former member of the convocation's off her rocker. Let's put her on a farm somewhere so she can have peace' - that's probably not likely. But her sitting around and not doing ANYTHING is also equally unlikely. So the reality is probably somewhere in between 'her being laughed at like a crazy person' and 'her sitting around doing nothing the whole time'

We really don't know.

But I know this isn't going to change any of your minds about your 'she did nothing and then committed genocide' fanfics of the situation, so I'll bow out here. Have a nice day.