You find out what makes your audience uncomfortable and present it to them in the most unsettling way possible. This is why horror movies aimed at young males contain vague allusions to homosexuality -- it's what makes that audience nervous. So, if you have a country scared that communists are secretly infiltrating society, you give them 's Invasion of the Body Snatchers. If you have a nation coming off a recession and spiraling violent crime rates in , you give them Friday the 13th. And if your country is terrified of people with dreadlocks, you make Predator.