i dont think its insane. If it was for a national emergency test, then why would they call it a presidential alert? A national emergency test is called just that, not a presidential alert.
In my opinion, that is just the start. For what? Who the hell knows. But i dont think its crazy to assume that its his instrument to stir up propaganda of fear. Whether its to conjure up a fake missle crises to get the support of Americans to strike a country first (a threat that never was), attempt to ensure his re-election at time of war, or just blurt out his mumbo-jumbo to everyone who doesnt care what he says. Every empire falls, and Trump might just be the last nail in the coffin. Its better to hope for the best and prepare for the worst. Everyone is comfortable with giving up a little freedom for safety. But over time so much freedom has been given up that it is normal. And if people dont see that every little freedom that gets taken away since 9/11, the terrorists have won.
If Trump is allowed to send me a message without my consent, without me being able to block it and use my phone at the same time (not throw it in the lake to avoid hearing "Believe Me"), then I will jump on the band wagon of him violating my rights. Whether i care or not. Its a stupid small issue, but if he knows he can bully us regarding small issues, then he will surely try larger ones. And we might just let him.