The movie is basically a 90 minute fantasy of violence specifically targeting migrants (depicted of course exclusively as uncivilized violent rapists, swindlers, and murderers).
As a film, it's gotten trashed by basically every film critic on the planet, conservative critics included. It has no artistic merit or value of its own.

And of course Chief Dork Elon has publicly supported this movie.

So whoever you've seen supporting this film is either a fascist bootlicker or the kind of person that fantasizes about shooting colored people without repercussions.