Out of common decency, the pharmacist should have agreed to Heinz's deal, but he was under no moral obligation to do so, so from my previous post, no, Heinz should not steal the drug.
The person’s right to life is greater than the person’s right to property
Your personal opinion that you have no basis for. In fact, according to survival of the fittest, he should not have helped out Heinz. Heinz's wife apparently was not fit to survive. Evolution makes no provision for charity or kindness, those instances where one organism helps another, it would be for the benefit of itself, not the other organism.