The meat industry sees veganism (especially) as a huge threat (slightly ridiculously as it is almost certainly never going to include the entire population), and does everything it can to make a fuss if it is promoted in any way. Recently they made an enormous fuss about a leaflet from the vegan society which was to be discussed by GCSE students as part of a debate for course work, and demanded its withdrawal.
Anyone who has the ability to reduce their meat intake and cares about the impact on global warming and who even cares about animals should think about doing this. Many people in developing countries are so poor that they have no choice.
It is not at all difficult to do.