Meat is a a dangerous thing. Just as bad as alcohol and cigarettes. Both alcohol and cigarettes have a "sin" tax and now it's time for meat to get such.
The tax on meat will help pay for the healthcare costs that come along with eating meat. People want to stop global warming but the best way to do this is to discourage people from meat.
Meat promotes cancer, diabetes, heart issues, obesity etc. Obesity is a big problem in the U.S. and this will make a change.