[MitchellC]

Why would a perfect creation create sin?

Sin isn't a "thing," so much as it is the natural opposite of a thing, God's will.

If creation were perfect, that would mean it was the way God wanted it to be.

God created a creation that could share his will only by acting freely.

As for why God would create a world that would fall, what is the point of the question? Is it impossible that a perfect God would do such a thing?

[Dimensio]

As for why God would create a world that would fall, what is the point of the question? Is it impossible that a perfect God would do such a thing?

It really depends on your definition of "perfect". Perfect simply means conforming to a standard with no deviation whatsoever. Perfect by itself, with no qualifications regarding the standard, is meaningless, so given specific standards it is possible for a "perfect" God to create a world that would fall, even if this "perfect" God was completely capable of creating a world that would not fall. It just depends on what you mean by "perfect".