You're not going to get some defense of the US here, there's well known connections between America's tryst with Slavery and Jim Crow and its dysfunctional government services.
But I'd love to see a Venn diagram of countries that "Actually Colonized" (tm) and countries with really generous welfare systems/labor protections. I am guessing it'll be close to a single circle w/ some countries that are actually just a bunch of banks in a trench coat, sitting on the outside (looking at you Switzerland).
Letting most of your population twiddle your thumbs all summer without any consequences means you're mortgaging some sort of early lead, that's really all it is. Europeans don't have some magic productivity pill for the rest of the year that keeps you ahead of the curve.