one might also argue that the presence of innocents should be a deterrent thus effectively crippling the moral against the immoral in an existential struggle. that is covered under:

Geneva Convention relative to the Protection of Civilian Persons in Time of War
Adopted on 12 August 1949 by the Diplomatic Conference for the Establishment of
International Conventions for the Protection of Victims of War, held in Geneva
from 21 April to 12 August, 1949
entry into force 21 October 1950

Article 28
The presence of a protected person may not be used to render certain points or areas immune from military operations.

http://www.unhchr.ch/html/menu3/b/92.htm

thus the presence of innocents does not protect an enemy.

case in point. the use of civilians to protect military assets that can be used to attack.