Do you have a blog?
If yes, then you could do this: Write a response, and save it. Wait one week. Read the response again, whether you still agree with what it says. If you do, publish it as an article on your blog. (If during the week you wrote more responses on the same topic, join them. If the response is too short for an article, just keep it in the database in case you will later write more reponses on the same topic.)
By doing this you could transform the response-writing impulse into something valuable, assuming that you care about blogging e.g. for reasons of status (articles are higher status than comments) or Adsense money. Waiting one week and posting on a different place than what made you angry could reduce the flamewar risk.
I do have a blog, but it won't work for this purpose (it's got way more readers than any comment flamewar I'm likely to participate in, so I'd probably create a larger flamewar in my own comments). Nice idea though.
This is the public group instrumental rationality diary for the week of December 10th. It's a place to record and chat about it if you have done, or are actively doing, things like:
Or anything else interesting which you want to share, so that other people can think about it, and perhaps be inspired to take action themselves. Try to include enough details so that everyone can use each other's experiences to learn about what tends to work out, and what doesn't tend to work out.
Thanks to everyone who contributes!
Previous diary; archive of prior diaries.