Maybe because it was done with good intentions to have a positive effect. And that it was actively sprayed. That makes it different to toxins that were releas

Maybe because it was done with good intentions to have a positive effect. And that it was actively sprayed. That makes it different to toxins that were released as a byproduct of some other process or product. You see the same kind of feelings around fluoride in water, vaccination, etc. It is actions that break normalcy bias, have no obvious monetary advantage, are done at large scale.