The U.S also consistently happens to rank as one of the world's most charitable countries on a per capita basis (not just in total dollar value donated, though in this too it ranks in the top spot). This ranking has been noted by many sources across many years. American individualism being a terrible thing again... (Yes, sarcasm)
This statistic is highly influenced by income tier, donations to religious organisations like churches, the tax code and as a form of a social safety net that might otherwise be missing.
And none of that changes the basic fact that they tend to donate a lot of money, goods and time to charity-related projects. It's almost like saying "yes sure they donate, but it doesn't count because of this random list of reasons that I don't like".
Also, another major myth of the U.S is that social safety nets don't exist. They're not as well woven as they are in many developed countries, but they're very present and heavily funded. In fact, the single largest annual U.S federal budgetary outlay, costing trillions per year is the whole range of social support programs managed by its government (see link below).
What's more, keep in mind that managing such a thing is much harder in a country of 320 million people than it is in your average European state, of which none have a population of over 90 million (Russia excluded). The U.S social safety net could be much better, especially if spending on other things were discounted, but it's not absent or even close to it.
Also, I partly exclude military spending, because though this viewpoint won't be popular at all here, the colossal U.S defense budget works as a sort of (very flawed) global safety net for many other countries in their relations with certain neighbors.
