The world has been evolved through certain rational stages and some bad things are bound to be there together with good things. If bad things are sought to be removed, the balance would end and it would be another calamity. Today somebody enjoys great happiness, heavenly happiness, after going through many an ordeal but if they are eliminated, the joy of success would be missing. Thus, there is absolutely no flaw in the world created by God and any interference would give rise to imbalance which will be a great calamity.
To contain our ego, kartaham iti manyase, we need to know that God's world is perfect and if at all, we become His instruments, that is all would be the best way of understanding our efforts to serve God's world. Eknathji says :
To say that the imperfect world of God is being perfected by somebody would be ridiculous, because he does not know the implications thereof and if he imagines that he is doing good, it would only inflate his ego which is suicidal to him and therefore, the service for the betterment of the world, is also a myth and an unwarranted thing and thus not service in the real sense of the term.