Eh, the movie is about cheap thrills and space action. It’s not like wanting to advertise First Blood without weaponry because there’s more to the Rambo character (in that movie) than violence.
First Blood is a really bad example, I take it you haven’t seen that film in awhile - it’d actually more sense if Rambo didn’t have a machine gun on the poster.
Anyway, I’m not saying they shouldn’t have guns on the poster, just saying it’s not that egregious if they don’t.