There's a difference between ignorance and stupidity. Some people just don't know any better. I kept a couple of my fish in really small tanks and bowls before, but that doesn't mean that I cared about them any less.
I was just uninformed.
Now, if someone let's say...worked at a pet store or considered themselves "fish experts" and then proceeded to talk about how it's perfectly okay to put something like a Betta or Goldfish in a bowl or vase that was one gallon or less yeahhh I'd call them stupid, but a lot of people are just ignorant.
I was once.
Everyone here was once, I'm sure.
Ignorance is what fuels knowledge in the first place.