Tim's point about Wikipedia's obsession with "secondary sources" is correct, and I have the same view. Use primary sources, but sparingly.
However, in actuality, many of the newspaper sources are secondary sources -- they are some reporter's interpretation or summary of some document or incident. The primary source in this case would be the actual document itself. At least this is the interpretation which Wikipedia uses to justify using newspapers as sources. To take an example (already quoted above in my RfC vote).
In the Charlie Gard case, an internal email by the hospital was read in court (and was thus part of the public record). That court transcript is the primary source. The email said: "The spanner in the works has been a parent-driven exploration of all alternatives internationally leading to a new specialist who has recommended a three month trial of nucleosides."
As I read the email (and as the judge read it, and the hospital maintains was its intention), the email is not blaming the parents. It is simply saying that the rather desperate (and ultimately futile) attempts to find alternatives has indeed led to a possibility worth exploring (but was ultimately judged as not in the baby's interests by the doctors).
However, when the quote is abbreviated (simply saying "spanner in the works"), it looks like the hospital is blaming the parents. The judge contributed to this confusion by wrongly paraphrasing the email as saying "Parents are the spanner in the works" -- you can find this mangled quote in the Wikipedia article itself,
citing a "reliable source". You can find countless pieces on the internet repeating this confusion. So, in this case, the "reliable" judge is wrong on the quote, while The
Daily Mail is right (because it used the court transcript, or that it had a reporter covering the proceedings, or that it had the actual email itself -- one of the family's PR agents actually wrote articles on this matter for the
Daily Mail).
Needless to say, I think the overall Daily Mail spin on the matter is wrong, while the judge's judgement is right (his judgement was upheld by an appellate court and the European court).
The lesson is that finding the truth is not easy or mechanical.