I don't understand the naivete of how some people seem to believe they have a strong grasp on how/what millions of other people think. Actually, I may have a h

I don't understand the naivete of how some people seem to believe they have a strong grasp on how/what millions of other people think. Actually, I may have a half-decent understanding of it, but any such beliefs are necessarily speculative. What I really don't understand is why people who work with systems for a living seem to be largely unable/unwilling to think of our planet as a system of interconnected/interactive systems, that have certain complex behaviors, and if you want to produce certain output, it requires specific input (that needs to be determined by understanding the system).