Nobody's saying it's "morally wrong" not to give your kids antidepressants - but nor is it morally wrong to give them to them.
What tends to be "morally wrong" is when parents are like "I'm not giving my kids those pills! There's no such thing as depression! Just go play outside some more!" - in other words, dismissing your children's feelings
I can agree, but I often think those commentors would probably be dismissing the parents diagnosis of the child expressing themselves, rather than dismissing the child.
Children are experiencing everything growing at once. They have preferences, they have new experience, everything is very close to "the first time this has ever happened" and so, can be a very big deal for them, at the time.
¯\_(ツ)_/¯ internet arguments about parenting, experiences, assholes, having one, putting it in others faces, etc. The internet is just talking to a bunch of people who have different ideas. I wouldn't take it too seriously, over half of it is bots or socially inept people anyway
What tends to be "morally wrong" is when parents are like "I'm not giving my kids those pills! There's no such thing as depression! Just go play outside some more!" - in other words, dismissing your children's feelings