It's a disservice if articulating the flaws in that article is the best thing you can do with your time. Without that proviso, you get Someone Is Wrong On The Internet syndrome.

(And, as SolveIt points out, people inevitably have other priorities besides helping others in every way possible all the time.)

It's also a disservice to not donate all but a tiny fraction of your income to poorer people. How many people do you know that does that?