Fantasy : How do you feel about taking something from real life and…

How do you feel about taking something from real life and…

... turning it into a cool genre movie or show? It can be a person, event, myth or even a symbol (like a country's flag or shield). This happens more often in the super-hero genre, but not always (like this year's GODS OF EGYPT). I ask because I've read/heard from time to time people saying that it's disrespectful.
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