I too ache with sadness for them. One thing is for sure, Jett was loved very, very much. From what I'm reading, a lot of the speculation isn't so much abput the fact Jett had a seizure but the fact that many experts on Autisim, after seeing signs of Jett's actions and speech, believe he was Autistic. Apparently even family members believe this. However, the Church Of Scientology does not believe in Autism so the Travolta's never gave Jett that label, they used Kawasaki's Disease instead, as the cause for his "slowness". Proper treatment for Autism may have helped Jett out tremendously.

Anyway, I agree with everyone else that this isn't a time for judgement but rather for sadness. As Dmpl said there is no greater loss than that of a parent losing a child. It is beyond tragic.