I think most people aren't thinking about these things on the surface level of their first playthrough though. They likely like Venat because she's pretty cool until you start to think about her actions. And most people aren't actually thinking about the greater implications of her actions in the moment. This is what happened to me with mine. It was good for me because I turned my brain off and did exactly what the writers wanted me to do which was "roll with it" and not think about it logically; Get swept away with their emotional music and don't think about the implications and thus, I enjoyed it!
Now? When I think about the complete and utter cringe factor of making "Life is Suffering" a key theme of a game, I laugh out loud. But I didn't feel that way immediately and it took me a bit to piece together what I knew about the Final Days and how I had already been told that no one knew the cause of it which therefore logically meant that she had withheld info from her people and thus doomed them all. They don't give you time to stop and ponder that stuff. It's like a Michael Bay movie. Here are some dramatic explosions to distract you from the fact that this story has more holes in it than fishnet stockings.
I also took her at her word that she would choose who to tell and always fight for her world and that nothing was impossible. It irked me that she was allowing Hermes to get away with it, but again I went along with it like they wanted me to. I enjoyed the game so much after that first time that I thought about it constantly! And I am thankful for that because all of that thinking is what made me realize what an absolute manipulative mess it is. I never liked Hermes and was pissed when I saw him included in the closing credits but the full picture of what Venat had done to her people and her manipulation of us since Day One didn't hit home immediately.
It's funny how often people bring up Zenos' line about whether his actions would have been acceptable had they met with our approval, but never point out how that applies perfectly to Venat. Her betrayal of her people and genocide seems to be acceptable and accepted because it benefits the player character. The dev team and her fans will jump through hoops to try to justify it but at the end of the day, she's not a hero because her travesty worked out in my favor. She did something absolutely villainous and will always be a villain to me.