Should we also include other externalities due to animal product consumption? E.g. climate change.
Re-reading this exchange, I'd like to add that it may be worth discussing those externalities in other Wiki articles, such as dietary change.
The general concern is that interventions optimized for humans may be suboptimal when non-human welfare is taken into account. Climate change is bad for human and (at least naively) non-human animals alike, so it doesn't seem like an effect this article should discuss.