We should absolutely be scrutinizing the fossil fuel industry. There's also no reason to _shift_ blame; both can be blamed at the same time. Ulterior motives behind the origin of carbon footprints does not negate the impact of our diets - particularly animal agriculture.
Electric cars are sold to wealthy people so they can maintain their lifestyle with a fresh narrative of being the solution. Meanwhile, a few meters of road being built releases massive amounts of crap to the air.
Lab-grown meat is the same. Bioreactors taking resources from states away to pump out goo for people to eat states away is not sustainable and will never be sustainable.
We need to return to the land, but governments work hard to ensure every last human is a citizen, and produces wealth for someone else. People who resisted were met with violence and their land seized. The system is going to collapse, I really don't have hope. But the least you could do is spare people the party line of blame and shame. /doomer-rant
This is pretty well documented:
http://www.fao.org/gleam/results/en/
Also, whether one is a vegan or not is irrelevant to the question. These are systemic issues based on, as you yourself say, the lack of price put on CO2 emissions to account for their externalities.
However, the lack of political will to do so up to this point doesn't mean we can or should end industrial society and return to the land. There are less dramatic solution paths, but they will need time to acculturate.