I've never been too worried about the fact that much produce is fertilised with animal manure, as I think it's currently not possible for the vast majority of people to source veganically-farmed fruit and veg, and because it's also something that'll sort itself out gradually as veganism becomes more widespread. Obviously, veganic farming is preferable, but I think that with a (hopefully) shrinking animal sector, the economics will turn against animal-derived fertiliser quite naturally.
Here's another article about farming:
https://www.theguardian.com/environment/2019/dec/24/vegetables-vegan-organic-agriculture-farming
I've never been too worried about the fact that much produce is fertilised with animal manure, as I think it's currently not possible for the vast majority of people to source veganically-farmed fruit and veg, and because it's also something that'll sort itself out gradually as veganism becomes more widespread. Obviously, veganic farming is preferable, but I think that with a (hopefully) shrinking animal sector, the economics will turn against animal-derived fertiliser quite naturally.