Hey, now. I went out of my way to look up comparable rates for the same phenomena with the exact same definitions.
But like I said, college spikes up the suicide rate, not high schools. And that is true in both USA and Japan. Let's go for some more detailed and specific data. I found some better data for comparison:
http://www.oecd.org/els/family/48968307.pdfSource: OECD. Measurement: suicides in 15-19 age bracket, graphed from 1990 to 2008. So, a good source and a very specific measure that should give a good representation of highschool suicide rates in the comparative countries of USA vs Japan.
in 1990, Japan had a rate of 4.0, and America had a rate of 11.0. So Japan had around 35% of the American teen suicide rate back then. By 2008, Japan's rate rose to 8.0 and America's fell to 7.0. So the Japanese rate was 14% higher than America for 2008. But take a look at 2005, and the American rate was also 8.0, same as 2008 Japan. So, a teen in 2008 Japan was just as likely to kill themselves as a teen in 2005 America. That doesn't sound like enough of a trend to say anything specific about the Japanese school system systematically causing suicides (especially since it was even more strict 20 years ago and had a very low rate).
So until 1990, Japan had a low rate, and America had a high rate, but by about 2005 those rates had equalized. Since it's down in America, nobody is particularly concerned - things got better! - so nobody is ringing the alarm bells. But in Japan since it was rare before, but now it's more common, people are alarmed and writing tons of articles trying to find a reason why. Blaming something that didn't actually change over time - the school system - for the increased rate doesn't sound like a satisfactory answer.