> Perhaps you can think of a way to design an alerting system which cannot be abused - but I can't. Isn't the obvious answer decentralization? Have persons necessary to send that message in different places across the country/outside the country needing to sign it for it to be sent. All taking the responsibility of following protocol in these cases.
Then the men with guns come and you can earnestly say “well guys, i know you want to declare the eternal republic of Basingstoke, but all I can do is send a warning about a tornado in Slough, is that close enough?”