“How is this relevant at all”
It’s directly related. If there’s a proscription of them then being outside in public altogether too much, then kal vchomer you shouldn’t be plastering their pictures all over the place to be displayed 24/7. (Even if you disagree with this very strong correlation, you certainly can’t deny this is at least a strong argument.)
“and what purpose does it have here other than to breed negativity for your entertainment?”
Why would you assume it’s designed to breed negativity, when all that was said was nothing more than a simple Halacha from Shulchan Aruch and Rambam (that is also in the Gemora and throughout the Halacha seforim throughout the generations without anyone making a machlokes against it.) Unless this Halacha makes you uncomfortable.
Halachos don’t make me uncomfortable. You do.