That God permits evil because He can draw good from it is a proclaiming of the overwhelming Glory of God! The theology of the Permissive Will of God is nothing of a permission nor attraction to commit sin - totally to the contrary once one grasps the teaching. It is a teaching of The Catholic Church and the Magisterium and contained both in Scripture and in the CCC as well as Catholic theology generally, though many do twist and distort what The Church states in accord with Scripture. To speak against this is to speak against The Church and The Magisterium, the teaching authority of The Catholic Church.
The Church Teaching and theology of The Permissive Will of God is all to little well understood within our Catholic Culture general speaking - and to our complete poverty being totally unable therefore to explain how evil comes into being if God and His Goodness is stronger than evil and the embodiment of evil.................
Catholic Catechism: http://www.scborromeo.org/ccc/p1s2c1p4.htm#324
311 Angels and men, as intelligent and free creatures, have to journey toward their ultimate destinies by their free choice and preferential love. They can therefore go astray. Indeed, they have sinned. Thus has moral evil, incommensurably more harmful than physical evil, entered the world. *God is in no way, directly or indirectly, the cause of moral evil.176 He *permits **it, however, because he respects the freedom of his creatures and, mysteriously, knows how to derive good from it:
For almighty God. . ., because he is supremely good, would never allow any evil whatsoever to exist in his works if he were not so all-powerful and good as to cause good to emerge from evil itself.177
Book of Job - Douay Reims Catholic Translation:
Now on a certain day when the sons of God came to stand before the Lord, Satan also was present among them.  And the Lord said to him: Whence comest thou? And he answered and said: I have gone round about the earth, and walked through it.  And the Lord said to him: Hast thou considered my servant Job, that there is none like him in the earth, a simple and upright man, and fearing God, and avoiding evil?  And Satan answering, said: Doth Job fear God in vain?  Hast not thou made a fence for him, and his house, and all his substance round about, blessed the works of his hands, and his possession hath increased on the earth?
(* The sons of God*: The angels.-- Ibid. Satan also, etc. This passage represents to us in a figure, accommodated to the ways and understandings of men, 1. The restless endeavours of Satan against the servants of God; 2. That he can do nothing without God's permission; 3. That God doth not permit him to tempt them above their strength: but assists them by his divine grace in such manner, that the vain efforts of the enemy only serve to illustrate their virtue and increase their merit. ) But stretch forth thy hand a little, and touch all that he hath, and see if he blesseth thee not to thy face.  Then the Lord said to Satan: Behold, all that he hath is in thy hand: only put not forth thy hand upon his person. And Satan went forth from the presence of the Lord.
For those seeking to understand from Catholic Spiritual Direction website - and a reliable source of Catholic teaching:
God’s Permissive Will
But the phrase “God’s will” also touches another category of life-experience: suffering. Suffering, of one type or another, is our constant companion as we journey through this fallen world. God has revealed that suffering was not part of his original plan, but rather was the offspring of original sin, which ripped apart the harmony of God’s creation. His indicative will to our first parents in the Garden of Eden was “do not eat the fruit of the tree of the knowledge of good and evil” (Genesis 2:17). They disobeyed. Human nature fell; creation fell; evil attained a certain predominance in the human condition, giving rise to “the overwhelming misery which oppresses men and their inclination towards evil and death” (Catechism, 403).
Here is where the distinction between God’s indicative and permissive will comes in. God did not desire or command Adam and Eve to rebel against his plan, but he did permit them to do so. Likewise, throughout human history, God does not will evil to happen (and its consequence of suffering), but he does permit it. He certainly didn’t explicitly will the Holocaust, for example, but, on the other hand, he did permit it.
The question of why God permits some evil and the suffering that comes from it, even the suffering of innocents, is an extremely hard question to answer. Only the Christian faith as a whole gives a satisfactory response .....read on at above link also for the difference between the Indicative & Permissive Will of God