1 - The Ancients weren't shown to be unwilling to listen to reason when it came to working to the benefit of Etheirys. Even when Emet-Selch was sceptical of the story told to him by the player character, he vowed to take it seriously since it was his sworn duty as a member of the Convocation. A key point to remember is that Venat wrote off the Ancients based on information she had available that would have helped them. Nor was it ever a guarantee that they were fated to destroy themselves - it was very much framed as her opinion, rather than an inevitable conclusion.
2 - We have no confirmation as to how much she told her supporters, especially when much of her actions involved feigning Zodiark as being the reason for her actions. Keeping Zodiark's power in check was not her actual goal, nor was the third round of sacrifices the reason for doing what she did. A point she herself raises during the conversation in Elpis when speaking about the act.
3 - I've always found such arguments to be disingenuous, personally. The game frequently markets the story as its main selling point and actively encourages speculation, so expecting consistency doesn't strike me as an unreasonable demand. I also do not think that it is unfair to point out that the game had a very different atmosphere back in the days of ARR and HW. An atmosphere many of us came to enjoy and wish to see more of. I'm not sure where you're getting the idea that I want Game of Thrones level of writing or grit, either. I've only ever pushed for the main characters to not be clad in plot armour at every possible turn.
4 - I noted that you made this comment in another thread related to the story:
Just as I wouldn't expect people to deliberately go into a thread praising the story and claiming that it's terrible, I think that deliberately going into a thread where people are raising concerns is very much a faux pas. Obviously I can't stop you, though I will say that I don't see much point in endless circular arguments about an issue that is very much a matter of subjective personal tastes.
I'm not misunderstanding the story. I simply don't agree with Venat's reasoning and I recognise that there were alternative routes that she could have taken as outlined above. She chose to inflict genocide upon her own people after deciding to write them off in favour of fawning over the Sundered instead.
I'm not going to suddenly change my mind and proclaim that genocide is perfectly acceptable so long as it is done a certain way and at this point, after a fair bit of me stating that it's fine to agree to disagree I find it pretty strange to see attempts to change what is obviously a strongly held belief. Over a fictional event, no less.
At this point, I'm pretty much just awaiting the upcoming Live Letter so we can get an indication of the upcoming story. I'm pretty excited to have my character become an adventurer again and I look forward to fighting more 'humble' threats for a while.