@Boogs
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The Algebraist" uses a MacGuffin to drive the story, in the form of a supposed obfuscated list of the locations of a huge number of endpoints for instant transport via "wormholes". They have to be located where there is very low gravity.
At the end of the book it turns out that there is such a transport network, using that technology, but that it solves the low gravity requirement in an unexpected way.
But there's a description of the "unexpected" (for the reader) solution at the start of chapter two of the book, packaged in such a way that most readers will miss it.
I always think of it when there's a simple solution to what seems like a complicated question. In this case, yours, about "successful" flame wars
Every flame war is successful for
someone.
Flame Wars entertain some people:
A. The "Dark Triad", many of whom enjoy the ensuing chaos, "sow the wind" on purpose, and enjoy feeding the flames with "accelerants".
B. People with intemperant, inflexible views start them with the unjustified confidence that they have the only correct opinion on the topic, and all others are heretics who should be fed to the flames. Or if they start some other way, these people are drawn to discussion on those topics like moths to a lamp - they participate because they
must.
C. Anyone who just enjoys the game can manipulate the other groups, and might do so for their own amusement, without the destructive goals of the dark triad.
I could probably make the list longer, but that covers a majority of cases.
The point is that flame wars are not usually random. They form due to the actions of people who want, or don't mind, the possible ignition, and they burn because they and others choose to feed the flames.
A and B start them over nothing. (C)
could start them, but (generally) don't.
It follows that the answer to "can the be a successful flame war" is a simple one. Yes - they are all successful.
But the full answer isn't so simple, because few, if any, are successful for
every participant and/or involved party.
A & B will keep going forever. Serious mental issues (A) and the need to impose "correct thought" on others (B) provide infinite energy for engagement.
Of course there will be collateral damage, but neither A nor B care about that, no matter how serious it is.