Wto doesn't set tarrifs. Countries do. WTO makes rules about administering tarrifs with the main one being the most favoured nation principle, except where there's a proper trade deal.
I still have a hope of playing football for Scotland, despite being in my forties, hugely overweight and shite at football.
I feel like my hope is still about 100x more plausible than yours.
Us among others, of course they did. The EU 's tarrifs on agricultural products are horrifically harmful to some of the lower cost producers across the med.
Having zero tarrifs on things like lychees is hardly going to hurt domestic production.