People tend to be passionate about things they like, so strong opinions are a given. Don't let it discourage you from posting though.
I too think that good Olivia on the SubKane route can be cruel. Not sure about evil, but I can see how she (secretly) enjoys the power dynamic and almost toys with Kane (but without the malice of the evil path). I suppose women enjoying their high status compared to men is a given on a Sub route.
As for Deliliah, we had no reason to suspect otherwise until a few episodes ago, where Kane's parentage was hinted at (pretty much confirmed). And since the game doesn't have incest, they can't be blood relatives.
P.S. My posts are being deleted by the mod! Must be some Veronica enjoyer.