Don't feel too sorry. For most Amber alerts, the child was never in any real danger (often some custody battle thing where a parent "stole" the kid, often to try to protect them), or, by the time the alert went out, it was already too late. I went and looked it up and it's not clear if there's ever been a case where Amber alerts actually helped to save a kid. If there has been, it's extremely rare. In some ways, they actually hurt because the police get flooded with a bunch of reports that are just wrong.

You can't turn off presidential alerts on American-sold smartphones (iOS/Android)

Same. I work 11pm to 7am, I put significant effort into never leaving my house during the day because outside my house is an abundance of the 2 worst things in existence, people and the sun.

Edit: fixed a typo.