The UK does already use them, and they’re pretty rare and have proven to be effective. Especially during a recent storm Éowyn in Northern Ireland where nobody died. I genuinely believe that it did actually save lives. Before the alert people were like “oh, it’s just a bit of wind”. But after the alert was sent out and their phone screamed at them, they seemed to realise it actually was pretty serious.

Here is every emergency alert ever issued in the UK

I know some conspiracy nuts disable them because they think the government is tracking you or something really stupid