Right, and that's a really good example of what I'm getting at. I'm glad you said that. An example here is that if I'm trying to encourage people to sign a petition, and the petition I have in mind is over pharmacare, and I'm directing towards something about.... You can see how “drugs” is an issue, but they are prescription drugs, not illegal drugs, whereas somebody else is trying to get a petition signed that is dealing with the issue of LSD or heroin or whatever. You can see how there's a certain overlap that is inherently problematic.
I'm just throwing that out again as more of a comment than a question, but can I ask if the book they use is a source that's available for us to see if we ask for it? Is it the sort of thing we could take a look at? I don't doubt their objectivity or their best efforts; I'm just genuinely curious as to what it contains.