Azkaban was not created, in-canon, in order to specifically deter potential Dark Lords. Its history is never stated, but it seems likely that it is a fairly old arrangement between the wizards and the dementors. It was created, instead, as a prison for ordinary criminals (viz. the woman Harry hears pleading while in Azkaban, who is forced to keep reliving the moment of her presumably accidental murder). The Dark Lord and his followers were indeed put in Azkaban when the opportunity arose, but this was for their crimes in the way of murder and such, not for their intention to take over magical Britain. Dark Lords are not very common (the only marginally-modern ones mentioned are Voldemort and Grindelwald, and Grindelwald is not even put in Azkaban, nor ever really messes with Britain except with the Muggle side, aka World War II). With this in mind, I think it becomes very obvious that Azkaban is vastly, awe-inspiringly overkill in the SP.
The Dark Lord and his followers were indeed put in Azkaban when the opportunity arose, but this was for their crimes in the way of murder and such, not for their intention to take over magical Britain.
Many Death Eaters were put in Azkaban, but Voldemort never was. Indeed, there's no evidence in canon that Azkaban has ever been used to hold a Dark Lord.
Also, and this has come up before although I forget whether it was in this specific thread, increasing the severity of punishments statistically tends not to result in a reduction in the rate of crimes, w...
- This thread has run its course. You will find newer threads in the discussion section.
Another discussion thread - the fourth - has reached the (arbitrary?) 500 comments threshold, so it's time for a new thread for Eliezer Yudkowsky's widely-praised Harry Potter fanfic.
Most of the paratext and fan-made resources are listed on Mr. LessWrong's author page. There is also AdeleneDawner's collection of most of the previously-published Author's Notes.
Older threads: one, two, three, four. By tag.
Newer threads are in the Discussion section, starting from Part 6.
Spoiler policy as suggested by Unnamed and approved by Eliezer, me, and at least three other upmodders:
It would also be quite sensible and welcome to continue the practice of declaring at the top of your post which chapters you are about to discuss, especially for newly-published ones, so that people who haven't yet seen them can stop reading in time.