Well we certainly have had enough of exports.
The problems with evidence based policies is they ignore "da feelz" that are so important to [some] people. Harm based drugs laws would immediately make alcohol and tobacco things of the past, for example.
The there's the paedo paradox. Children are 1000x more likely to be abused by someone they know and see regularly than some random bush-dwelling figment of MN imagination. However try and get that one through without being mobbed.
Climate change ? Well we had the solution. In our grasp. But would rather boil with our feelz intact than risk actually exposing them to scrutiny.