Telling people to feel bad about eating animal protein but to keep driving their cars that destroy the environment, shopping at stores that underpay their employees, purchasing items that are made with diminishing resources in countries that pay close to nothing to their labor force is picking an arbitrary battle in a war of existence.
Promoting making better choices will always be more effective than asking people to feel guilty over existing at all.
Source your food locally if you can, cook and eat only what you need, etc.
So much so that we prefer to not think about it to prop up cognitive dissonance.
I think "wanting people to feel bad" is more an urge that people at least acknowledge the dissonance. Many people don't even get that far because it's so uncomfortable.