Seriously? In a large scale disaster (hurricane, earthquake, etc) you would be irritated by getting a free text telling you...[whatever]
Why should he need to explain his reasons to you (or to anyone)? If he doesn't want to receive such a message on his phone, why shouldn't he be able to block or reject it? You'd rather force the message on him because you think it's a good idea, even if he doesn't?
"Ask not what A Group of Employees can do for you. But ask what can All Employees do for A Group of Employees." -- Mike Dennison