Because it's a fear-mongering angle that still sells. AI has been a vehicle for scifi for so long that trying to convince Boomers that of won't kill us all is the hard part.
I'm a moderate user for code and skeptic of LLM abilities, but 5 years from now when we are leveraging ML models for groundbreaking science and haven't been nuked by SkyNet, all of this will look quaint and silly.
I haven't lived in the US in a while, and every time I visit and one of these things starts shouting at me, I wonder how anyone tolerates this shit.
Occasionally you'll see one button that's more worn, maybe bottom right iirc, that mutes it. Doesn't always work, though.