https://en.wikipedia.org/wiki/List_of_countries_by_homeless_...
https://en.wikipedia.org/wiki/List_of_countries_by_homeless_...
Furthermore, most of these figures includes people that are insufficiently housed like on a friends couch, in a windowless room, in temporary shelters and such, and do not tell you much about the population of people "on the streets".
You should at least consider the possibility that what you said isn't really true and just fits your preconceived notion of a heartless US society versus a supposedly more social environment in Europe.
The US leads the world in volunteering. https://www.oecd.org/els/family/CO4.1-Participation-voluntar...
You can also look at BLS info: https://www.bls.gov/news.release/pdf/volun.pdf
Most cities have programs with volunteering with the homeless, just visit a nearby church and ask. Clothes, food and resumes are pretty popular things to help with.
http://www.oecd.org/els/family/HC3-1-Homeless-population.pdf
Please raise the level of discourse here by offering new information to support your claim.
The USA undeniably has a low macro rates of homelessness overall, but I wonder if it has high micro levels of homelessness, e.g. Sydney seems to have lower rates of homelessness than San Francisco or Seattle, even though Australia has a higher homelessness rate than the USA overall. I wonder as I can't find any data that uses the same measurements across cities and countries and is easy to compare.
On numbers, Seattle has 12,000 homeless according to wikipedia, and I can't find similar numbers for Sydney. Given Sydney is about 15% larger than greater Seattle, it would need to be closer to 14,000 to be the same. I doubt Sydney has that many Homeless, but with no data I guess it may.
I could be completely off base here, but I do think the USA has some really concentrated pockets of homelessness, and that skews people's views, in both directions, based on personal experience.
Of course for the perception of a non-homeless person, the problem will appear more drastic with a higher concentration.