Exactly!!
Even if Michael asked for it because surely he was desperate for some relief, does that mean that this doctor had to give it to him knowing full well that it could be lethal? Did Michael know all those drugs Murray gave him that night could kill him? No! but Murray should have known, he is after all the expert, the physician not Michael. There is absolutely no excuse for it. He took the Hyppocrital oath and that takes precedence over money, fame, anything!! No excuses for Murray!!
To blame Michael for his death is outrageous! First of all he had been administered propofol before and he came out of it just fine. So why not go back to something that had worked before? Yes, he was warned about the risks, but we all get warned about risks before we take medications or anesthesia. He made sure he had a medical doctor to administer it to him. If Murray thought it was too risky he should have said no to Michael period. Especially after he had already injected him with other powerful sedatives? That is just crazy!! and then he leaves the room????
If this story of Nurse Lee, telling Michael of the dangers of using propofol is true, then yes, Michael should have known that the drugs Murray gave him were fatal.
But in terms of who deserves the blame, that would depend on who came up with the brilliant idea that propofol was safe as long as Michael was monitored. If it was the anesthesiologist who supposedly accompanied him during the HIStory tour, then it means that Michael was going by past experience in choosing propofol as a solution now, and not a doctor's advice. In other words, he just went along with it because he didn't die before. What doesn't kill you, makes you stronger, yes? In my opinion, that definitely puts Michael at fault because he went with his own head, rather than a proper doctor's advice for treating insomnia.
I mean, just imagine a scenario. You are walking home from your friend's house and there are two paths, one is through the woods, and the other is your usual route. The former is a 10 minute walk back home, and the latter is a half an hour walk. You ask a nearby officer to escort you home, and he says, "Let's take the path through the woods, it's faster and it'll be safe as long as I am around". In the end, you make it through unscathed! Congratulations, you've just had one hell of an experience with the new route!
During your second visit, your friend warns you about the dangers of the woods, saying that it's full of wild animals. And you tell your friend, "Don't worry, I'll be safe as long as I have a police officer to escort me". As you are returning home, you walk up to the nearest police officer and you say, "I just need you to follow me home through the woods. I've been through there before anyway, so we'll definitely be safe." The officer seems hesitant, and so you offer him an extra bonus of $5 (god knows why, I'm just imagining here) to take you home, and he agrees.
As both of you are walking through the woods, a wolf jumps out and eats you, while the officer manages to flee. Who is at fault in this scenario, for the brilliant idea of walking through the woods because it was "safe" the first time round (a.k.a propofol as a cure for insomnia)?
This is just going by the favoured story of the media, that Michael went doctor-shopping for someone who would give him propofol.
However, if there was no such anesthesiologist during the HIStory tour, and Michael had never experienced propofol before, this would mean that Murray was the one to recommend propofol, and the one who reassured of its safety. In this case, coming back to my imaginary scenario. The first time you actually cross through the woods, you end up being eaten by a tiger (god knows what that's doing there, still imagination). You put your trust in the police officer's words, and you end up dead. Such a pity, do you deserve to be blamed if you had no idea of the dangers of the woods (until your friend told you on your second visit)?
I'm sure we can all agree that Murray himself should have known about the dangers of propofol, so he is not excused from the blame at all. It doesn't matter if he was desperate, of if he was starstruck by Michael. He took the risk upon himself by going beyond what a doctor should be doing. Just as in my imaginary scenario, the second police officer knew the woods was dangerous, that's why he hesitated. But he went with it because you waved a piece of paper in his face. He knew and yet, he didn't try his best to talk you out of it, the same as Murray probably didn't even try to talk Michael out of propofol. Nope, he tried to wean Michael off with even more drugs, and ended up killing him.
Nonetheless, if the first scenario is true, Michael, whether we like it or not, does deserve some blame. And indeed, he payed handsomely for it, he's dead isn't he? If Michael has to face the highest charge for his side of the blame, I don't want this doctor walking after a mere slap to the hand.