The Jargon File (version 4.4.7, 29 Dec 2003):

considered harmful
 adj.

    [very common] Edsger W. Dijkstra's note in the March 1968 Communications of
    the ACM, Goto Statement Considered Harmful, fired the first salvo in the
    structured programming wars (text at http://www.acm.org/classics/). As it
    turns out, the title under which the letter appeared was actually supplied
    by CACM's editor, Niklaus Wirth. Amusingly, the ACM considered the
    resulting acrimony sufficiently harmful that it will (by policy) no longer
    print an article taking so assertive a position against a coding practice.
    (Years afterwards, a contrary view was uttered in a CACM letter called,
    inevitably, ?Goto considered harmful? considered harmful''. In the ensuing
    decades, a large number of both serious papers and parodies have borne
    titles of the form X considered Y. The structured-programming wars
    eventually blew over with the realization that both sides were wrong, but
    use of such titles has remained as a persistent minor in-joke (the
    ?considered silly? found at various places in this lexicon is related).


The Free On-line Dictionary of Computing (30 December 2018):

considered harmful

    A type of phrase based on the title of
   Edsger W. Dijkstra's famous note in the March 1968
   Communications of the ACM, "Goto Statement Considered Harmful",
   which fired the first salvo in the structured programming wars.

   Amusingly, the ACM considered the resulting acrimony
   sufficiently harmful that it will (by policy) no longer print
   articles taking so assertive a position against a coding practice.

   In the ensuing decades, a large number of both serious papers and
   parodies bore titles of the form "X considered Y".  The
   structured-programming wars eventually blew over with the
   realisation that both sides were wrong, but use of such titles has
   remained as a persistent minor in-joke.

   [Jargon File]

   (2014-06-21)