This is a silly argument! You're like Piers Morgan! "Do you know how absurd you sound?" good lord. Make a real argument, this one is so pathetically ridiculous, you are insisting that you know their motives but your logic doesn't even make sense, OF COURSE if you are dying you want to get a message out.
Even if it did make any logical sense to say someone would never even fathom using a mobile device to post a message at a time like that (totally doesn't...) you still can't assert it with such certainty. People do not think straight in situations like these.