Have you seen that one Eddie Murphy/Tyler Perry/Martin Lawrence movie Nanna Fatty's Circus of Sass? If you have, then I've already proven my point. Happy Martin Luther King, Jr. Day. For the counterpoint, check out "Cody's Least Popular Blog Post: Why All Black Comedians Are Doing It Wrong" here.
Sometimes it's just a matter of making the US Department of Defense look, like, REALLY cool.
Actual impending doom like global climate change or mass extinction just makes people bored.
In some cases, the Marvel source material just did better.