I haven't read the books in a long time, but I was interested by Did Voldemort actually curse the job of Defense Against Dark Arts professor after being denied the position? and similar questions so I figured I'd ask.
If Voldemort cursed the DADA position, why did he then try to use that position as leverage?
According to the answer to Was Quirrell the Defense against the Dark Arts teacher for more than one year?, Quirrell was previously the Muggle Studies teacher, until he met Voldemort and returned as DADA teacher. Now, I can understand Voldemort not wanting to have to hang around while Quirrell does his Muggle Studies classes, but surely moving Quirrell to a job that Voldemort cursed is... kind of a stupid idea. In such a weakened state, surely Voldemort would have been better off bearing with the Muggle Studies until he got his hands on the Philosopher's Stone. After all, what if it took more than one year to reach it?
This then happens again in book four, when Barty Crouch Jr. infiltrated the school, posing as Moody. Surely it would have been more reliable to post him as a teacher in a subject not carrying that one-year-max curse on it.
It seems odd to me that Voldemort would put his minions in a position that he cursed himself. Did he have a particular reason for doing this, or was it just an oversight, blinded by the thoughts of success?