I mean... Why do the smart people not "just" develop a perfect economic plan? Or "just" end world hunger? Or "just" stop global conflicts?
Anyway, there have been multitudes of plans and strategies and actions to chip away at the problem. All of them require sacrificing political capital, raising taxes and the costs of products, and effort. And you get nothing substantial in return.
So while the entire scientific community tried pushing education and solutions galore, the political and corporate establishment fought tooth and nail against any aspect that did not immediately profit them. To the point that now an entire party in the richest country on Earth that holds all three branches of government uses opposition to solving the problem as one of the core tenants of their platform.