What do you think were his policies on illegal immigration?
What do you think happened to ol' blueie there? It's well-known that the Emperor disliked non-humans and didn't allow any to serve in his military, although Vader wasn't as racist and was willing to use alien bounty hunters.
>that's just EU shit
While it's never implicitly stated in the movies, can you think of another reason why there's not a single alien Storm Trooper or Imperial Officer? Hell, there aren't even non-white Imperial Officers.
The cantina scene in ANH does some pretty heavy world building about the vast amount of different species in their galaxy.
>implying it doesn't destroy the problem at its root
Just think about it. People probably won't be able to illegaly immigrate into Alderaan and in all likelyhood, noone will ever attempt to emmigrate from there as well, effectively reducing illegal immigration involving Alderaan by 100 percent.