Why did NATO bomb Serbia?

I frequently come across people who question the motive of NATO's intervention against Serbia. According to these people, the NATO's intervention was not only unwarranted but also illegitimate and unjustifiable. Many left revisionists in the West as well as apologists for the Serbian aggression in Bosnia claim that the U.S. sought to impose its hegemony in the Balkans. They believe that the U.S. was deliberately dehumanizing Serbian people during the war in Bosnia and Kosovo. No explanation has ever been offered as to why the U.S. was supposedly biased towards Serbian people.

Now, while it goes without saying that the U.S. foreign policy is extremely flawed and discriminatory, this allegation is preposterous. That the U.S. administration has strategic and economic interests in the region is an irrefutable fact. This does not by any means mean that the intervention was unwarranted and unjustifiable. If the potential victim of a rape is rescued by someone I do not think that the victim cares why she has been rescued. The important thing is that she had been rescued. Likewise, the fact that the NATO’s intervention put an end to the Serbian aggression and subsequently the suffering of the Bosnians and Kosovars is a justification in itself. Some experts assert that the NATO’s intervention merely exacerbated the conflict in Kosovo. This is inaccurate, all we know for sure is that it stopped the war, didn’t it? What was the alternative? Stand by and do nothing? Watch innocent people being slaughtered every day? That is cowardice. When an innocent person is suffering then we are morally obliged to put an end to that person’s suffering. Indifference and apathy are by far the worst qualities a person can have.