The argument about processed foods (meat and otherwise) is pretty solid. Red meat... Open to debate. You need to keep in mind that most of our baselines come from the mid 20th century. Where everyone ate meat, so our definition of "healthy" is based on 70 year old averages. The median for "healthy" is a meat eater.

My spouse is vegan and super healthy. Yet some of her blood-works are borderline. As far as we can tell it's because she's vegan. It's the stats themselves that are biased against veganism. I think that if the studies were corrected meat eating would look MUCH worse than it does now.