You have you dealt with anyone having a seizure?
A person having a partial can either go blank for a few seconds, can appear to be daydreaming/fiddling with something, can become aggressive/frightened/confused, hallucinate, defecate, urinate, choke, vomit, injure themselves.
A person having a tonic will go rigid suddenly, and then drop to the floor.
A person having a tonic clonic, goes rigid suddenly, collapses. All muscles jerk, often violently. Sometimes they can bang their head. Sometimes they can end up with a friction burn. Sometimes they can have a serious injury. They often defecate, urinate, drool and might end up bleeding. They might need rescue medication by gum, rectum or injection. Sometimes they can vomit. They can choke on their vomit. They can wake up confused, drowsy, disorientated. They might have more than one seizure. They might go blue. They might have a different type of seizure to normal. They might in the very worst case scenario, rapidly become seriously unwell.
You have to support them to the floor, observe everything, time everything, whilst preventing serious injury to the person.
Do you honestly a think an untrained adult can easily do that, let alone a terrified 5 year old child?! What can a child do to help, short of run off for help leaving the fitting child unsupervised? What's to guarantee they would go for help? How would they know who to ask? Etc etc.
Do you honestly think a parent wanting to prevent their child from being put into that situation is just being unhelpful?!