I think what bothers me most about things like mothproof yarn is that in general the decision was made that we don't even need to know about these things. I was talking to my sister the other day about stuff in food. Soy was the item under discussion, I said I use soy but I like to do it on purpose. I see no reason for soy in breads, pancake mix, etc. We want to know what's in the things we use and not have to get magnifying glasses to read the fine print or go on quests to discover hidden secrets. We wisely avoided bringing GMOs into the conversation. I'm wondering if mothproof yarn has to be marked as such or is most wool yarn mothproof anyhow?
You're not crazy, you're a knitter.
There's a cure for crazy.