I also question the methodology behind those statistics. Many of them only count married parents as not being "single." My father would have counted for my sister, post-divorce, despite being a highly-ranked officer in the military who paid for her college with his GI Bill funds. So would my cousin, who is not married to the mother of his child but who is very much living a traditional domestic life with his partner and daughter.
The demonization and denigration of functional but unorthodox living arrangements is nothing new to American discourse.
Canadian, but I'm not really informed enough to answer your questions - just to point out that Canada and the USA have different racial demographics. They've got nearly the same % of white people, but Canada has a 3.4% black population vs 12.7% in the USA. (Canada mostly makes up the difference with Asian population, 14.7% vs 5.4%.)
The demonization and denigration of functional but unorthodox living arrangements is nothing new to American discourse.