God is raising a family. He want's that family to have free will. By exercising that free will against God's wishes Evil is born.
So he tolerates evil now to maximize everyone's chances to wise up - because this short blip of a timeline is the test range / proving ground / boot camp for who will get to spend eternity with Him as members of his spiritual family.
Those who embrace evil rather than seeking His will are discarded when the testing period is over. "Had their chance. Muffed it."

Will you take responsibility and graduate, or party your school years away?

Eternity is what counts. There will be no evil tolerated there.