What is the one BAD(worst) thing u want to remove from this WORLD ?

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well..i know there are so many things but i only want to know the one bad thing...if u ask me first then i would say Terrorism is the only thing i want to remove or u can say the word Hate is most suitable here...so, what does u people say about it...what in ur opinion is the one BAD thing which u want to remove from this world... many thanks in advance :)