Dont know many dogs that seek out waterways to piss!.
Or cats for that matter.
Indeed, read the bit about the breakdown in the soil.
The treatment of our seed grain crops et al, will have a far higher effect on waterways than any dogs or cats, given the acreage covered.
Dog pisses against lamppost. Rain washes it down drain. Drain flows into river. Metabolites kill insects in river.
No doubt they are trying to stop its use in other areas such as seed dressings - if these are equally damaging??? If you are going to stop its use in applications where it is causing death to 'friendly' insects, then it needs to be all those uses to reverse the downward spiral of insect numbers.
But you obviously know far more about it than the scientists, so carry on.