The emotional and moral sanctions cannot be duly replies to massacres. Our anger and moral condemnation against an evil or bad thing are always conditioned by the existence of some individuals who could be affected by our reaction.
Though there are authors of massacres, they lose their human individuality by committing a mass murder. The mass of the victims with unknown identity makes the murderer to rise above the common level of personal relations with other people. He does not become more powerful as an individual after the massacre, but he gets the power of those great forces which are deemed to modify the life of human communities: God, nature, fate, or the state.
Surely, this huge power has made quite attractive the massacres in the human history, in spite of the large emotional and moral sanctions against them. Nonetheless, this kind of reactions has encouraged the proliferation of using the massacres as sources of individual or political power, because all of them are weak replies. The individual life with all its emotions and moral feelings cannot stand against the great forces which decide the life of the human communities and among which the mass murderer places himself.
A great power cannot be defeated otherwise than by using a similar great power with the cost of using similar insensitive and immoral means.