https://www.youtube.com/watch?v=ORHAP6duw9E
The job is not "shoot aliens". It's manage aliens, including Earth's population of legal resident aliens (like the taxi driver who he delivers a baby for). The Big Bad of the film is indeed posing as a human, and Smith's character runs into an endless procession of innocent (or at least non-capital-crime) aliens he should not shoot along the way.
There's a reason he gets hired over all the military folks in the scene immediately blasting away at the aliens in the shooting range.
It starts with uncomfortable chairs and a written test on flimsy paper without desks; Smith's character noisily pulls over a table to write on while the military folks do the expected thing of struggling through. "You're everything we've come to expect from years of government training", they get told, and then their memories are wiped. Smith's character, instead, gets a briefing on the MIB and an intro to alien bugs pouring Kay some coffee.
(Said briefing also indicates Earth is a neutral zone for alien refugees. Again, "shoot first" is not what they want people doing!)
Yes, because he's Will Smith.
Not to be the tone police or anything, but a HN discussion of AI-powered mass murder really isn't the time to be glib.
