Not a message movie, as such, but raises questions around why humans would have a need to populate a new planet (why couldn't they take care of their old one?) and why David would spend so much time and energy experimenting on the alien.
Lots of blood and gore. A man burns to death; his charred body is shown. Aliens burst from characters' chests and backs. Face-hugger aliens. Character is beheaded; severed head shown floating in water. Characters are sick, vomiting, spewing blood. Character's face burned by alien acid. Shooting, explosions. Thousands of dead, blackened bodies. Fighting, kicking, stabbing with nail.
A couple has sex in shower in a somewhat graphic scene; they're interrupted. One naked breast shown. A woman removes her gear to reveal a tank top and starts to wash herself.
Multiple uses of "f--k," plus "s--t," "t-ts," "son of a bitch," "ass," "damn," "take a leak," "Jesus" as an exclamation.
Several characters drink whisky while toasting to a fallen comrade. Cigar smoking. Mention of drinking a "cold beer."