ER is a different culture. It is almost impossible to get bored in ER and the incompetent/lazy can't hide for very long. Nursing homes are very different. They are under pressure to cut costs and often end up treating people like cattle.
Also, I would not prejudge the case. Video evidence is important but this wouldn't be the first one a short video clip didn't tell the whole story.
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Whoever he was he still would still deserve dignity and consideration in his dying moments. That was why people objected to your comments. I doubt it was from a lack of appreciation for his WWII service, however it might have been expressed.