Science is now being decided by citizen juries, not scientists. Specifically in this case, two San Francisco juries.
Next they will be ruling on gravity.
Roundup is a target because it is manufactured by Monsanto, which has been thoroughly demonized for its leadership in developing genetically modified crops. Roundup is the agronomic complement to Roundup ready GMO's. Attacks on Roundup are thus seen by the luddite left as an indirect attack on GMO's. And since the EU countries don't want to compete against U.S. production agriculture, the Europeans prostitute the science to create non-tariff trade barriers. Junk science is highly politicized because it provides cover for dishonest agendas.