I think while your frustration is understandable and I feel it too, very much so (though I myself feel it in the overall direction of late stage capitalism in its entirety), in this instance you're confusing people immigrating with those seeking asylum.
The immigration debate is a reasonable one to have, but this particular post is about people fleeing danger, persecution and death, seeking asylum, not those simply wishing to immigrate.
What's wrong with the skeleton? It's stylised of course as these sorts of icons tend to be, but generally correct. Pelvis, spine, ribs, head, etc.
The megaphone seems like a very good way to evoke images of an abusive overseer controlling the camp's prisoners using technology of the modern day, an effective image for a section on monitoring and control, no?
There is no standardised symbol for fear within a person's mind, so again, a stylised symbol showing a lightning bolt is fine. Especially given that it is likely there on purpose - think shocks. Shocks of a different kind you may receive under an evil oppressive prisoner camp system (imagine the sudden shock in ones mind as a guard shouts or lashes out at you, I would certainly consider symbolising that in this manner).
It's as if you've never looked at anything anyone's made with simple clipart and the like before, and assume everything must be extremely deep and custom designed by experts?
Even if this were made with the help of AI, I don't see the message being any less valid, just because the person didn't go download an image editor to a PC, learn how to use it, learn how to import SVG icons and research for the most appropriate ones, build the image and export it appropriately, etc.
Not everybody is as skilled or capable as you or I may be in producing something that we might consider simple. Heck, some people only have a smartphone, not everybody has the luxury of owning a PC and proper software, nor the time or inclination to learn such tools.
The message in this image is conveyed very well, and is relevant to the current fascist regime's actions in the USA (and indeed is a universally important message).
If you want to suggest it's bad (or "slop", as you so evocatively put it) just because you don't like the image creator used to put it to print, well, that's a weird hill to die on, to be honest.
You better hope your country never duplicates the USA's slide into fascism, or you yourself may one day end up in a camp... or worse. How quick to attack the people trying to raise awareness of these abuses of human rights then, I wonder?