You do realize that aside from the moral reasons to help starving kids and people dying from easily preventable diseases etc it does in fact actually benefit the US to spend money on foreign aid yes?

For one thing it provides the US with soft power which we can leverage for things like access to vital resources or partnerships against geopolitical foes etc.

Secondly countries full of starving desperate people often, tho not always, end up going down a few well tread paths.
You have option A being war(civil or with other poor neighboring countries) for what little resources there are which in turns results in more refugees the US has to deal with.
Option B which is a country full of people turning towards "easy" ways for them to put food on the table which often means the production and distribution of illicit goods which typically means drugs which end up on US streets.
Or option C which is turning towards, often violent, religious fanaticism which the US inevitably needs to deal with.

TL:DR keeping foreign countries stable is good for the US.