It just isn't easy at all. If someone editorializes a Wikipedia article, they can:
- make claims without citation,
- cite a source which does not support the claims,
- misrepresent a source by citing it out of context, and
- perhaps most devious of all: Just not talk about aspects that they don't like.
You could write an entire Wikipedia article on Adolf Hitler with perfectly cited sources, which never mentions the genocide, the warmongering, that he lost the war etc..
You can use Wikipedia as an entrypoint for research, but you have to actually read the sources and find additional sources, independently from that.