The role of a doctor, when someone is sick, is to offer good advice and stop them doing anything that will be really damaging to themselves. I'd see this as more similar to a dying man getting access to a priest than anything else.
Maybe this woman would have been screaming at him anyway, but I can see why she would be angry. He is obviously being a bit arrogant. The dude was dying, let the family believe what they want at that point.