People are not stupid, just uninformed. It takes hard work to think independently and do the research it requires. No-one can invent the modern physics (for example) alone. You are always standing on the shoulders of others.
Because you have to rely on your intuition and the others you can quite easily follow the wrong prophets. Group thinking and the interests of the mind leaders are common reasons for the popular delusions and madnesses of the crowd.
In the CAGW discussion skeptics focus too much on science because the alarmists will not listen to facts. Credibility of their opinion leaders is a better target. They are surrogates of OPEC in the camouflage of the environmentalists and selected scientist. They are business men looking for government subsidies.NO