Competition, unforeseen and unforeseeable events, weather, and all sorts of other things undermine my predictions. (inc.com)
But all sorts of other things can have an impact on whether people complain, seemingly unrelated or only peripherally - related issues or events like Cambridge Analytica, concerns about privacy and so on.» (marketingindustrynews.com)
@Bob, If you assume that something's true just because people at the time believed it, you have to assume all sorts of other things are true, from Mormonism to Islam, as all had followers who believed and were aquainted and should have known whether it was true. (religion.blogs.cnn.com)