When some one says "secret recipe of 11 herbs & spices" my mind doesn't immediately jump to MSG as an herb or spice. Then to see that it is the primary ingredient definitely jumps out to me. Does it not to you?
Yeah it is a hard one to shake. My mom was not the least bit xenophobic but she did get serious headaches from MSG. But only when she knew she was eating it. And she loved tomatoes too! I miss her dearly, and she was actually quite sharp, but she would not let go of the MSG thing despite ample evidence to contradict her belief.
The headaches are real, but it's a similar pipeline/effect to caffeine/theobromine. Your brain wants at least a little MSG in your diet because it does exciting things with it. Your brain is also easily over-saturated with it and gets "hungover" if you eat/drink too much in too short an amount of time, and different people can be differently sensitive (just as with coffee/tea/chocolate/etc).
Certainly there were restaurants trying to sell you the "5-Hour Energy" equivalent of MSG and some cuisines tend to get closer to doing that naturally. But also you shouldn't directly or indirectly blame the people that make that food for you, just as it is silly to blame all coffee shops for the caffeine headaches and migraines you sometimes get if you don't watch how much coffee you are drinking.
It's seasoning, so it doesn't seem surprising at all that MSG would be pretty high on the list. Do you think that's bad?