What’s that socko?
I’m disappointed in the community note. You’d think they’d have learned the thing most high school seniors do/did. Don’t quote the Wikipedia article. Instead, quote the reference in the Wikipedia article. Much stronger of an argument.
Wikipedia editor here; there’s some nuance. This article is listed as a Good Article, meaning it’s been reviewed by another (almost certainly) experienced editor for verifiability, prose and style, coverage, neutrality, stability, etc. This was attained in 2013, and especially for such a prominent article, slipping below those standards is a recipe to get GA status revoked. Presumably this note is summarizing a large portion of coverage by Wikipedia and thus a variety of sources. You want to read and cite all of the sources rather than Wikipedia in something like a research paper, but for just a community note, there’s really nothing wrong with this.
Also, his family doesn’t just believe that the FBI was involved in his death. They provided convincing enough evidence for a judge to rule in court that the US government was responsible for MLK’s death.
I believe there are limited sources that are valid on community notes, including Wikipedia