It's a statement about immigrants being people, that the hateful stories we tell about them are false that we have responsibility to them as fellow humans. It advocates for no specific political action, you can hold these beliefs and still be against immigration for whatever reason.
It's also a statement against rational thinking and discussions because it portrays both sides to an almost satirical level: "no borders" vs "all migrants are thieves/murderer/bombers"
Same applies to entire countries; their capabilities and societal will are greater than an individual's, but still limited.
Declarations of very broad commitments towards the rest of humanity may sound noble, but wise(r) people should stay away from them.
And in this case to me the blank is "take on the world's tired huddled masses and set them up to be just as self-sufficient and successful as their native born." And I think that's pretty actionable, just about anyone could probably think of more than a few things that would push us closer to this.