YSK: When you want to learn the facts on a controversial topic, check Wikipedia
When there is a heated, with a lot of strong and exaggerated arguments on both sides, and I don't know what to believe, or I'm overwhelmed with the raw information, I look at Wikipedia. Or even something that is not a current event, but the information I found on the internet doesn't feel reliable.
I'm sure some would find flaws there, but they do a good job of keeping it neutral and sticking to verifiable facts.
For purely scientific articles Wikipedia is great. But anything remotely controversial or even political on that site should be taken with a grain of salt.
There's too many editors out there who enforce their biases and wage war on such articles.
A wikipedia sources list is not some sort of list of all available data on a subject. It's a list of what information was used to build the article.
On anything remotely divisive, there will be available primary sources for multiple viewpoints, and obviously a slanted article will largely contain sources supporting its slant and leave out sources that don't. Just checking the sources can easily result in the illusion of consensus where there is none.
In this case, the primary relevant fact checking skill would be searching for sources independent of Wikipedia, in which case, why was one starting with Wikipedia in the first place?
Often, collecting and correlating sources that agree with one viewpoint of a complex issue, which is the whole problem we were discussing. If a wiki article is camped by an admin with a slant, as they often are, the sources do not represent some neutral middle ground or wisdom of the crowd, they represent the things that ended up in the article and nothing more. If you want to learn the facts of a controversial topic, why would you start with a potentially biased list?