In the Source Material ...
Yup, the comic and movie are pretty much identical -- as long as you cut out all the "I make this look good"s and "It just be rainin' black people in New York!"s and replace them with a whole bunch of murder.
"Now that's what I'm talkin' ab- oh, God."
The whole point of the comic is that the Men in Black -- like the modern urban folklore that they take their name from -- are the brutal enforcers of a secret fascist state that controls every detail of modern life. I seriously cannot impress upon you what massive dicks they are. Remember the "neurolyzer" device that Agent K (Tommy Lee Jones) uses to convince a housewife that the alien she saw was swamp gas refracting off of Venus, and then Will Smith gets to be charming and convince her to hire an interior decorator because damn? In the comics, they still have neurolyzers, only K uses them to convince teenagers to kill themselves.
And suddenly the scene where Will Smith gets the job after shooting a little girl in the face makes sense.
The tagline of the movie -- "Protecting the Earth from the scum of the universe" -- only applies to the Men in Black of the comics if you imagine that "scum of the universe" refers to "thinking, feeling human beings." And also you need to change "protecting" to "controlling." And then cut out "from" and replace it with a period, and the beginning of a whole new ... this isn't working. My point is that the Men in Black were originally meant to be significantly more horrifying than David Christopher Bell could ever imagine.
Also, that fucking hair.