Aren't we all part of some problem one way or the other. You could make the same point to a Programmer in the Banking Industry who is unaware that he is literally creating a predatory interest calculation for a debt scheme by writing code.
The article is there to raise awareness about the problems in the advertising industry, and one effect is that no one can claim they didn't know.
We should all consider the consequences of what we work on shouldn't we?
The fact that other people don't isn't a counter argument...