Why would that be the better question?
Because it's been animal products that have been under attack for 60 years, not plants, that's why. Beginning in the 80s, people en masse abandoned butter, lard and other animal fats in favor of vegetable oils like margarine, canola oil, soy bean oil, corn oil, etc.. Why do you suppose that happened? Have you ever taken the time to look into how much sugar you are consuming on a daily basis? How much of it were people eating on average in the 1970s?
'I wouldn't join any organization that would have me as a member', said Woody Allen IIRC
I believe that Groucho Marx was the originator of that statement. Worded a little differently though.