I agree 100% - that guy is basically in a living hell every moment he is conscious. The problem is, many people can be resuscitated from an od with minimal or no lasting effects. In this particular case, I don't think the response was wrong - he (probably) wasn't suicidal, just someone looking to party. It may not even have been his fault - if he was used to taking a certain amount of H, and this time it was cut with more F than usual or just higher purity, he may have thought he was bring safe and just getting high as normal.
I've read about a few failed opioid od's on ss. Many of them involve pills, patches, or simply not enough of the drug. Like I said, if 200mg is the minimal fatal dose for most non-tolerant people, it doesn't make sense to only do double that amount. H is definitely cheap enough to buy 10x the lethal dose.
I haven't found any concrete data, but I would imagine because you are cooking the solute into a solution using heat and citric or ascorbic acid, you could probably obtain a concentration of 500mg-1000mg/ml - which means at most, you would need to inject 5ml of the solution for 2000mg of H.