it's because we're trusting politicians and we're not trusting the scientists and listening to people who value logic and truth over emotional persuasion. Politicians are the problem. The incentives are not aligned properly at all.
scientists are not saints, and neither gods aware of everyone's needs/desires/preferences. They are corruptible just like anyone, including climatologists:
http://www.naturalnews.com/045695_global_warming_fabricated_data_scientific_fraud.htmlthat's why is probably better not to let anyone to take decisions for you.