Is there no statute of limitations on these things? This, being white, being male, and murder. Everything else is forgiven.
It is not a case of a 'statue of limitations' here, it is the firehose of unedited, under-informed internet denizens with no feedback mechanism! Someone with a gripe, social, business or political, makes an accusation, generally about someone already in the public eye.
In the last generation system of public information like newspapers or media, an editor was employed to check facts, see if the 'news' was worth the limited newspaper inches or airtime and then make it a go/no-go decision. Now, none of this exists, there is an unlimited bandwidth, no real fact-checking and no editor.
Garbage in and garbage out!