What does what your ancestors did have to do with what we now know about modern factory farming? The question was about still eating beef despite what we know today, what does that have to do with your ancestors? Is your comment not the very definition of a strawman?
The future will absolutely not look down on cultures that have to rely on animals for food. Do we look at native Americans as horrible people because they had to slaughter animals, in a controlled, and relatively well thought out manner?
Personally I believe the most likely alternative will be bugs. Do bugs not count as an animal? Or would you say bugs shouldn't be eaten either
They would drive animals off cliffs. That would cause horror if they were to repeat it today yes.
Just stop eating living animals it's that simple, but if you want to eat bugs, knock yourself out.
I think we'll find "plagues" of species more common and end up harvesting as many as possible then so that "locust" is the primary protein source for that year.
Its not that simple. I can see why you believe it is, and it probably helps contribute to why you have little empathy even for those who show you they physically cant.