|Yeah but they WOULD have died AND many died off screen between John's first encounter and Sam and Dean's final encounter with the creature. |
I'm not saying they have to make a meal out of it but they have to get rid of these characters as quickly and dramatically as possible so Sam and Dean can get back on the road and on with the hunting evil for revenge thing that they do.
No those were 3 month year old babies dying. Supernatural may be dark with monsters and evil demons but killing kids is way too dark for this show.