why not?

Krsna is the root of everything; therefore rendering service to the Supreme Personality of Godhead, Krsna (krsna-seva), means automatically serving all the demigods. Sometimes it is argued that karma and jnana require a mixture of bhakti in order to be successfully executed, and sometimes it is argued that bhakti also requires karma and jnana for its successful termination. The fact is, however, that although karma and jnana cannot be successful without bhakti, bhakti does not require the help of karma and jnana. Actually, as described by Srila Rupa Gosvami, anyabhilasita-sunyam jnana-karmady-anavrtam: pure devotional service should not be contaminated by the touch of karma and jnana. Modern society is involved in various types of philanthropic works, humanitarian works, and so on, but people do not know that these activities will never be successful unless Krsna, the Supreme Personality of Godhead, is brought into the center. One may ask what harm there is in worshiping Krsna and the different parts of His body, the demigods, and the answer is also given in this verse. The point is that by supplying food to the stomach, the indriyas, the senses, are automatically satisfied. If one tries to feed his eyes or ears independently, the result is only havoc. Simply by supplying food to the stomach, we satisfy all of the senses. It is neither necessary nor feasible to render separate service to the individual senses. The conclusion is that by serving Krsna (krsna-seva), everything is complete. As confirmed in Caitanya-caritamrta: krsne bhakti kaile sarva-karma krta haya (Cc. Madhya 22.62). If one is engaged in the devotional service of the Lord, the Supreme Personality of Godhead, everything is automatically accomplished.    (More...)