The bible also encourages sacrificing animals. It's a book full of contradictions, so no matter what you want to argue, you can find some choice quotes supporting your position.
Books like the bible narrates multiples points of views, read them as an history book and you'll catch a glimpse an era lifestyle. Read every line as a single thesis and you get messy pack of contradictory ideas.
I'm not sure where you find "encourages", most sacrifices are depicted to show Jesus's fury about it. Perhaps the old testament? In any case that doesn't contradict the point of "we always had ideals".