The Naylor tweet, incidentally, is degrees worse that Blatchford's now infamous column, which in comparison seems merely stupid and insensitive. Her argument, as I read it, is that Mr. Layton's final letter to Canadians was a political rather than personal document, and this therefore cheapens the occasion of his death.
But of course Mr Layton was a politician and, contrary to common belief, this is not a character flaw. For some, at least, it is a job. And in reality the letter shows Jack Layton fulfilling his duties as leader of the nation's official opposition right up to the very end. Faced with his own eminent death, Layton systematically considered how news of it would play out in various corners of the public space, and tried his best to craft words that would send events in a slightly more positive direction. Hence his remarks specifically directed to other cancer patients, to Quebecers, to fellow party members, and so forth.
And of course the result is a political document, with all the flaws such things are heir to. How could it not be? The man didn't write it for kicks. He was working at the time.