Uggh. Look an armchair unqualified and outrage opinion by someone on Hacker News who has no idea what they are talking about.
Look up febrile seizure. Every parent know them. The recommendation by most doctors is to only bring in your child if their fever reaches 104, which he did.
You know what almost all new parents do? They bring their kids to the doctors at the slightest sign of trouble. You know what happens the first few times you do this? The doctors tell you to stop and they tell you you are over reacting.