I dont think that's all that silly of an assumption for comparing Western nations. They lead pretty similiar lifestyles.
Also, I specifically chose the metric i chose because while a country's unemployment rate is easy to find it's terrible for comparisons between countries. The ratio i chose was still easy to find data on as it has recently become a fashionable measurement amoung economists for doing exactly what i was doing. Was it the very best option i could have chosen to support my claim? Probably not but it was easy to find data for a ton of countries all at once and it is accurate enough to make my claim with. I'm not interested in sorting through a bunch of economic data on a couple dozen countries to bolster my arguement in an internet forum.
Basically, what i chose was good enough for the context.
As for the rest, as i'm sure you saw in the follow up comment, I poorly assumed that because it was an older article that the only person who would be replying was the person i had replied to earlier. My mistake and ignore all the non applicable junk i said.