This world is full of wickedness and injustice. Not only is there violence and wrong against us, making our hearts cry out, but many oppose God Himself. How many see right and wrong, and willfully choose what God opposes? How many speak evil against God and His word? How many slander His Son, Jesus Christ, and drag His name through the mud?
There will be a time when justice will be served. Not always as soon as it would make sense to us in our hurt, because God is willing to give a chance to turn away from evil and to Him for cleansing and forgiveness instead. But there is coming a day when all wickedness will give an account and face judgement.