Agreed on your first point. The process absolutely needs reform.

To your second. It's a truncation of the term "illegal alien": https://en.wikipedia.org/wiki/Alien_(law)

That's not propaganda, it's a legal term. Casting commonly accepted terms of the relevant lexicon in a political light only reveals your own political bias.

Recasting legal terminology into dehumanizing nouns is a propaganda technique. It's very obvious that you're here to grind an axe and your axe is a style I'm very familiar with.