(They might be less toxic to bees and the zooplankton mentioned in the OP, but they were more toxic to, e.g., human agricultural workers.)
From this, there are only two valid conclusions;
Pesticides was not previously being used, or the previous pesticide was less dangerous.
I certainly can’t see in the article that more fish died before the introduction of neonicotinoids.
Phasing these chemicals out requires a new sustainable approach to pest management - more buy-in from farmers for IPM approaches that don't involve routine use of toxic chemicals. Assistance and training programs need to be put in place to achieve this before regulatory restrictions should be applied.
https://geneticliteracyproject.org/2019/01/09/with-the-bee-c...
> Pyrethroid insecticides are supposedly low in toxicity to mammals and birds, but as the Washington Post has reported, it turns out they are highly toxic to most insects, including beneficial insects like honeybees; in fact they are considered far more harmful to bees than any neonic.
In the linked WaPo article, though, the only mention of "Pyrethroid" is this:
> Since the E.U. moratorium went into effect in 2014, farmers in England have struggled with increased pest pressure, Carreck said. Many have turned to pyrethroid pesticides, which have unknown consequences on bees and other beneficial insects. Pywell emphasized that if the E.U. continues the moratorium, we need to investigate what alternative pesticides are doing to bees.
:(
EDIT: Am I being downvoted for the truth? Or because of a very successful and incredibly effective PR campaign?
So yeah, if only the politicians would actually listen to the scientists instead of the lobbyists then neonicotinoids, like Roundup, would be banned, but unfortunately companies like Bayer, and formerly Monsanto, have staged an incredibly effective and successful lobbying / PR campaign.