Red meat isn’t carcinogenic, none of the research separated out whether the meat was fresh or processed, and didn’t factor in other parts of the diet that were being eaten. Highly processed meats such as bacon and sausages, not great for you, but fresh meat is fine.
I remember watching a documentary about the slaughter of elephants in a region of the Sahara, overseen by men with a scientific approach that claimed that desertification was being caused by too many elephants.
Elephants were culled, vegetation disappeared rapidly. Once they realised the whopping mistake they worked to reintroduce elephants and other grazing mammals to the area, which is slowly improving previously green areas.
Humans have this arrogance that we know best, better than the symbiotic relationship between animals and land. If animals aren’t farmed for food they wouldn’t exist, apart from in a very few petting zoos. It’s very naive to assume that they would exist just to look at them and not slaughter them. Landscapes and ecosystems as they are now would not exist, especially in the UK where there are still many farms that use more traditional methods (as opposed to feeding lots in USA and Argentina), and these are generally high welfare, prioritising the health of the animals. Soil quality with no animals would decline even further than it already has, thanks to moving away from animal fertiliser and moving onto intense arable systems. There would also be the issue of disposing of the huge amounts of waste products from all the crops once processed. Currently it’s all consumed by animals in one way or another. They eat it, or they sleep on it and poo on it and it’s put back on the land.
Of course there are abusive outliers in farms, but assuming that all farmers are abusive is the same as assuming all parents are abusive because of a handful of high profile abuse cases.
On the whole farmed animals for meat in the UK have good lives.
The problem is industrialised farming, for meat (in US) and arable (worldwide).
If the whole world went vegan there would be an ecological catastrophe and we’d be fast tracked to extinction.