Why so? For example, a patient can be perfectly nursed back to health. But can we prevent that person from getting sick again? No. We can only help this time.  There is nothing we can do for the sicknesses that person will suffer in countless future lives. In fact, any form of material help, be it food, clothing, or money, can only temporarily relieve those in need, never for long. The only way to completely and permanently release sentient beings from all suffering is to teach them the facts of samsara and guide them to practice the Dharma so as to bring them onto the path of liberation. Ultimately, this is the real benefit to sentient beings, indeed the true meaning of salvation.

~Depicted from THE RIGHT VIEW ~ Buddhism—the Definition