It was actually not science that the original ban was based on. Who knows whether the new EPA chief is basing the reversal on science or politics, but the end effect is probably a better policy than throwing bans around on chemicals that have major benefits reducing crop failures, starvation, pain, and suffering.
The bar to ban things has dropped so low because of that handwavey line of reasoning, despite real economic effects to people whose livelihoods are at stake (i.e. farmers).
