Another thought:
God might be allowing evil to continue in order to prove a point...
From the moment of Adam's rebellion against God, a new order of events began happening which continues to this day. That new order, through the effects of sin, altered the course of both man and creation. Both were affected by sin. Creation was no longer a paradise,(Gen. 3:17-18; Rom. 8:22) and people's very nature changed (Rom. 5:12;Eph. 2:3, Rom. 3:19-12) to go against God. Earth could never be confused with Heaven. There is no permanency of existence here on Earth - death is inevitable. There are no pain-free lives - everyone has a bull's eye on their back.
Why? We see that evil is a global force and it brings about suffering, reminding people that rebellion against God - from Adam's to ours - brings about pain, suffering and death.
