Not the US or any democratic power deliberately aims there bombs at civilians. In the Iraqi war the vast majority of shock & awe cruise missiles were aimed at military targets with civilian deaths been collateral damage.. Hamas for example are the opposite. They fire their rockets at civilian targets hoping to kill as many civilians as possible. If rockets are fired from a school as Hamas does, that school becomes a legitimate target.
The reason the US doesn't aim at civilians is because, as of the last ten or twenty years, they have the technology, money, and strategy that make such an approach possible.
Only a few decades ago, they didn't have the technology in sufficient quantity, and at that time nobody inside the armed forces or government suggested that there was any moral issue with collateral damage, that was not outweighed by the military objectives being pursued.
It's a pure luxury to avoid civilian casualties; the US was a functioning democracy when they nuked two cities in Japan to send a message to Russia; and when they and the UK (also a democracy) embarked on a deliberate campaign of fire-bombing German and Japanese cities for the express purpose of destroying worker's homes.
The moral niceties are a convenient opportunity for propaganda, when you have the power and the wealth to excercise them; but don't kid yourself that they are important to the military beyond their propaganda value. If a military objective requires it, the USAF have no more qualms than any other armed force in history about a few dead women and children.
Minimising civilian casualties is a 'nice to have', not a primary goal.