Amongst those who don’t see the point of them, not one on here has adequately explained just what their objection is.
I have lived in this planet more than 60 years and I have never needed an emergency alert. I've travelled all over the world to places that suffer earthquakes, wildfires, all manner of things. Where I live now, I can assure you those things will not happen.
It's a trade off; do I want to be startled (possibly from my sleep?) by a buzzer telling me the factory down the road is on fire, or will my life be better if I spot that out of the window after I get up for breakfast?
For anyone that wants the alarm, no problem, nobody is stopping you. But for me, I don't want it.