Moral propagation should be based on sound logic not by twisting its arms and leg.
Citing snake story and extracting moral from it seems disjointed and illogical. To extol the point, poor suicidal snake has been unduly dragged into the story which is against natural instinct. Snake killing itself with its own muscles defies and makes mockery of the natural law of survival which gives living creature an instinct to avoid pain or harm itself when in anguish. But to make post realistic, the snake part could be deleted and the rest stands profound on its own merit.