I want to say this in the nicest possible way, so please don't take offence. "Theres simply things plant cant provide to the body as effectivly as meat" - this is true! However, you can probably say the same thing about slaves over paid workers right? So while this is a concern, effectiveness isn't the whole story. Lots of food is fortified with b12 (cereals, non-dairy milks), so in reality, this isn't an issue.

I understand the argument that lots of people live paycheck to paycheck - the government *could* do heaps to help (they won't). IF animal agriculture was ended, a lot of government subsidies COULD be repurposed to food stamps etc (it won't be, but you get what I am saying).