Two points would pave the way for replying this query:
1. In certain instances,“filled” is a relative matter, and in few cases an absolute matter. When we say,“the pool is filled with water” it implies that“filling” is used in the true and absolute sense and may even denote that water is overflowing from it. However, in the sentence,“the hall is filled with people” , the term“filled” is used in a relative sense; because only the floor and seats are filled. But a few empty seats here and there wouldn’t contradict this sentence and besides, the space till the ceiling is empty too. Thus the sentence,“the hall is filled with people” is quite different from the sentence,“the pool is filled with water.”
That the earth is filled with cruelty and tyranny conveys a relative meaning. Of course, tyranny can be seen in all the human societies and though all the societies are morally disintegrating, yet, in the midst of all such tyranny, goodness and justice can still be found.
2. From the view of the holy Qur’an and Islamic terminology, injustice and tyranny is not restricted to social injustice and tyranny of the rulers. Instead, any sin and opposition to the divine commands and prohibitions is considered as injustice. One of the terms most used in the holy Qur’an is the word,“unjust to self” like:
“Our Lord! We have been unjust to ourselves.” (Qur’an, 7:23)
Or
“And had they, when they were unjust to themselves, come to you and asked forgiveness of Allah…………………..” (Qur’an, 4:64)
Also, the holy Qur’an interprets polytheism as a major offence:
“(Luqman says): “O my son! Do not associate with Allah; most surely polytheism is a grave iniquity.” (Qur’an, 31:13)
Consequently, the sentence,“the earth will be filled with injustice” implies that the earth will be filled with sin and corruption individually and collectively. This would open up the way for social tyranny by the hands of oppressive rulers.
The talk that the Westerners reckon their countries to be filled with justice due to implementation of their social laws is nothing but exaggeration. Firstly, individual crimes and moral degradation are rampant in these countries. Secondly, drug addiction, spiritual sickness, and depression in such countries are increasing day by day. Are not the unlimited financial transgression and individual violence, in the West, the sign of injustice? Where and in which country can we find security and complete peace? Can we label the collective transgression, colonial rule, and exploitation by countries for personal gains as justice? Is the conquest of the Islamic and the third world countries justice?
If the apparent rules prevail in the West, it is due to their success in exploiting other countries and attracting their wealth and manpower for themselves. Otherwise, not only true justice is absent in these countries, but there remains truth-seeking people who are still thirsty of justice and long for an ideal society.