It's easy to understand how Europeans look at Americans is if they're brain-dead. However, the article does nothing to support the thesis that young people in particular are killing other people. It may be true. If so, including evidence to that effect would make a better article.
I don't think that's the point. The point is that people are looking at the mortality curve of this illness, and it looks like it most severely affects the elderly. I've heard this point repeated all over the place as a "don't panic" qualifier, it's not so bad since you are not likely to be severely effected unless you are elderly.
But if you aren't in that severely effected part of the age curve, your actions still can significantly affect the spread and effect of this illness on others and the strained medical system as a whole.
It's not "young people are to blame" but "Just because you're young doesn't mean you shouldn't care about this"