WWII was entered into by a Democrat President (as was WWI). The decision to bomb civilian targets to destroy the enemy's ability to wage war is a fundamental tactic, and the the order was give by FDR. Meanwhile, Germany was waging war against whole civilian populations, for their race or religion. They attacked shipping indiscriminately. The "Rape of Nanking" by the Japanese was one of the worst war crimes of any century.
War is not nice, nor should it be. This antiseptic version of war today's lefties think is possible is not only delusional, but hides the horror of war; which, makes it more easy for those sitting at home to accept. If you aren't willing to play dirtier than your enemy then you will lose. The Dems have forgoten how they won two word wars and have instead given us Korea, Vietnam, the Taliban and ISIS.
“When bad men combine, the good must associate; else they will fall, one by one, an unpitied sacrifice in a contemptible struggle.” Edumnd Burke