I am not accusing Taco Bell of selling contaminated meat but merely pointing out that "blandness" is almost the least of your problems if you rely on feedlot animals or culled dairy cows for your beef.
There's a constant push-pull between what is environmentally "best" and what is economically sensible. So, how to make the world better, and do it in a reasonable way? To start, you should gather information.
As a scientist who has dedicated her life to improving livestock welfare, I am extremely alarmed that the USDA has paid so little attention to the animal welfare implications of their Humane Slaughter Act.