No injustice will takes place in this world!

You must realize that the whole world is the kingdom of God as stated by Jesus. Any injustice will be punished by Him and you need not worry about it. Your view of the punishment is revenge but His view of punishment is to transform the soul. If somebody has stolen your money, don’t pray to God to punish that person. Everything is recorded by Him unlike the courts which register the case only when a complaint is given. The enquiry by God takes place immediately. Sometimes you find no punishment from God and you are scolding God. The silence of God means that the enquiry was completed and the judgment was “no punishment”.

In the previous birth, you might have stolen money from that person and today you paid along with the compound interest. In this case, there cannot be punishment and the enquiry was over.
Since you do not know this, you mistake God for His silence. Suppose such background is not there, then you will get your money with interest in some other way, which is compensated by God. That person will lose the money along with the interest. You will see it with your eyes. But suppose you cursed that person with revenge, you will receive the punishment in addition to the above. Kauravas stole a share of wealth of Pandavas and finally they lost their whole kingdom.

Pandavas gained the total kingdom, which is double the share. But Draupadi was cursing Kauravas aspiring always for the revenge. She was also punished for this as she lost all her children. Therefore, we should not scold even our enemy even by words or mind. God takes care of the entire case. If the injustice wins, it is a black mark for His administration only. He is well aware of it and will take the necessary action. He is more serious in your case than yourself.