Maybe just to prime Harry with Azkaban, to drive a wedge between him and all magical authority that supports it, to prepare him to go Dark, and to be absolutely certain he’d act in a hurry if, say, Hermione was imprisoned there.
The other major effect of the Azkaban arc was to convince Dumbledore, and through him Madam Bones who commands the Aurors, that Voldemort has returned. While Dumbledore thinks Voldemort is around, he’s less likely to suspect or investigate Quirrel as the cause of any new disasters; and he also prohibits Harry from leaving Hogwarts, which drives Harry to Quirrel for help if he must leave—such as, again, to help Hermione.
Besides, Quirrel may be right when he says he didn’t think the Azkaban breakout was such a big risk (of discovery), he just didn’t anticipate Harry interfering against orders and then stunning him due to the resonance.
Maybe just to prime Harry with Azkaban, to drive a wedge between him and all magical authority that supports it, to prepare him to go Dark, and to be absolutely certain he’d act in a hurry if, say, Hermione was imprisoned there.
The other major effect of the Azkaban arc was to convince Dumbledore, and through him Madam Bones who commands the Aurors, that Voldemort has returned. While Dumbledore thinks Voldemort is around, he’s less likely to suspect or investigate Quirrel as the cause of any new disasters; and he also prohibits Harry from leaving Hogwarts, which drives Harry to Quirrel for help if he must leave—such as, again, to help Hermione.
Besides, Quirrel may be right when he says he didn’t think the Azkaban breakout was such a big risk (of discovery), he just didn’t anticipate Harry interfering against orders and then stunning him due to the resonance.