It is not immoral to enquire about how someone died and it is certainly not "cold".
That being said, the people in this argument, HERE mostly fall into two, self interested groups.
1. Those who are engaged in the same substance abuse as Nasser.
Naturally they are the least interested in the cause of his death because that would shake their vigilant adoption of the time honored cure for all ailments (the head in the sand).
2. People who do not use steroids.
Who wish to hear that he died from steroids because they are jealous / envious of those who have the guts/stupidity/balls (whichever particular polarity you go on what they are doing) to trade life for muscle.
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Just for the record - I don't think either group are immoral. We're humans, we need to survive - whatever we can learn that helps that.. helps. Being nosey might seem like being nosey - but it's just another way an organism stays on top of its environment.