It matters because, while any underlying facts may be true, the article can present the facts in an inaccurate way or a way that suggests an incorrect conclusion.

Breitbart is a fantastic example.

What trespass said, but also this: When we link the article, we expand the amount of people that it reaches to. Two things happen due to this:

• The brand name of Breitbart becomes known for a person, likely without critical thinking.
• Breitbart earns more money, as more clicks translate to more revenue through ads.

Hence, by linking their articles, we directly end up supporting them.