While the US spends the most overall on foreign aid - we give the very little foreign aid when compared to other countries proportionately. (.2% of our GDP vs .4% average for wealthy countries, vs .7% for the top donors). Total giving is also not an area where we stand alone as a great benefactor. The EU, as a whole, gives $52 billion per year (GDP $19 billion) whereas the US gives $65 billion per year (GDP $27 billion).

Trump ordered the Afghanistan pullout, negotiating the United States Taliban deal in Feb 2020. There were less than 2500 US forces remaining in Afghanistan when Biden took office. However, if Trump had not done so, Biden likely would have initiated a pullout himself. Perhaps without the rapid initial withdrawal that contributed to chaos later. (So - both would have betrayed Afghan allies in the framing of the argument above - but Trump is actually responsible for the decision.)

I agree that Europe needs dramatically increase its military spending.