If I were to delete one thing on earth, I would choose hatred.
Without hatred, people could still have different beliefs, opinions, and religions, but they would treat each other with respect and kindness. Removing hatred would reduce wars, discrimination, and conflict, allowing humanity to focus on solving problems together instead of fighting each other.
I would like to ask for the world to remove the greed for power. The greed for power is responsible for the unrest in the world. Check the past history, at that time, kings used to fight against other states to expand their power, in return people from both sides had to lose their lives and most of the deaths were common people. Those rulers used to sit on the throne and rule in exchange for the blood of common people.
You will see the same attitude in modern times too. Powerful countries use weak countries to increase their power. They indulge in every evil activity to come to power and maintain power. The death of millions of people is considered very easy for those cruel rulers. They only want to rule for many years.