Earlier quoted context omitted.
As I began in my second paragraph above, people do need to eat something. Right now that means sacrifice the environment if we want to keep everyone alive in the short term. Long term we could have farming that has zero environmental impact, like vertical farming with fully contained and controlled environment. It would cost huge amount of money and with the current economical system it would be impossible to feed ev…
IMHO going vegan is the only practical strategy for reducing the impact of your diet. You have no practical way of knowing most of what's going on in the supply chain for most products, or their true carbon footprint, but overall, the footprint of growing plants and feeding them to animals is way higher than just eating plants yourself. The laws of physics are, to some extent, "on your side" when it comes to boycotti…
Being a mass murder of fewer victim than some other mass murders can be an important distinction for some people.
Still I would highlight that a small scale farmer or hobbyist who raises his own animals has likely less blood on their hand than a vegan who live in a city and eat imported fresh veggies.
There is also the aspect of long term strategies. Vegan diets are not sustainable and long term we do need to change how we produce food. Shell fish and seaweed are one of the few sources of food that we could produce in very large quantities without harming the environment around us. Insect farms would be an alternative, but those seems much less likely to be effective in term of changing the world.
There is a lot of green washing in crop farming. Practically all production of artificial fertilizers uses natural gas, and leaks from those operations is one of the major contributors to global warming. We have waters as large as the Baltic ocean being turned into a desert from runoff. People may feel happy to not eat fish, but fish were killed in order to produce the food that people eat. The deaths "just" happen to be a byproduct that accumulate slowly under the surface, and slowly moves towards mass extinction.