We must treat everything that exists in this world as necessary. There is nothing that would exist in vain and did not play its role in the complex mosaic of nature. Although it seems to us that there are some superfluous and even harmful elements that we want to get rid of. But the more we study nature, the more clearly the deep interconnection between all its parts can be seen. Each blade of grass grows only because of the need for its participation in the global harmony of nature. Any negative, in our opinion, phenomena appear only in order for a person to change his attitude to reality and see that everything exists in its true, perfect form, necessary for the general development of nature.