In 1965, India was at the door step of a huge famine. Tens of millions of people could parish if there was no emergency wheat supply from the US. In that year, United States shipped one-fifth of it's entire wheat harvest to India to prevent the famine. Although India was then allied with Soviet Union, not United States. USA could have used this wheat supply as a pressure tactic to achieve geo-political concession from India. But USA did not gain any geo-political objective by this huge help to India. As we can see, in the following years, India became even more Soviet friendly and antagonistic towards USA.
In 1992, USA conducted a humanitarian intervention in Somalia. Where warring factions was using food as a weapon. Thousands of civilian were dying in hunger. In that intervention, US lost 43 of it's soldiers in a mission where there was no geo-political interest at stake for US.
Similarly US intervention in Bosnia and Kosovo to save Muslim population there also served no material benefits for US. In these interventions, US was vehemently opposed by Russia and China. Russia and China was aligned with genocidal Serbs. For the last 70 years, Russia and China has became the default patronizer of genocidal regimes around the world. From North Korea to Khmer Rouge Cambodia, from Darfur Sudan to junta lead myanmar. Syria's Assad, Gaddafi's Libya, Saddam's Iraq. Everywhere China and Russia are with the genocidal dictators. American hands are not clean either entirely. It had to compromise with many military rulers in it's fight against Communism. But in most of the cases, US is in the right sides.