No, I don't think DDT should be legalized. The cons do not outweigh the pros, and we have viable alternatives without such drawbacks.

There's no valid excuse for someone to release DDT into the atmosphere, so there's no need to track and hold people accountable, if you're correctly blocking imports and manufacture. To my knowledge, its not a controlled substance like morphine or something

Some of us think that AI is like DDT in that just holding people accountable for using it negligently will not be enough to prevent the harms of AI's cancelling out the benefits.