it also requires aesthetic needs to be met, social needs, and self actualization. for many people, those may require that you, for instance, master french cuisine, or eat your grandmother's lasagna, or just have hotdog and beer at the ballpark.
vegans have been around since the 1940s, and my guess is there are more now than ever, but the meat industry grows year-over-year every year. being vegan doesn't decrease the amount of meat dairy or eggs produced. it certainly doesn't reduce the amount of vegetables grown.
it doesn't apply to government thugs in public buildings