ScotM was an active (and top-notch) participant at this site for about seven months (December 2014–July 2015), but he last answered a question at EL&U on July 20, 2015, and his profile lists him as "Last seen Jan 10 '16 at 8:27."
The problem I want to resolve involves his answer to Etymology of "cut someone some slack", which he posted on February 1, 2015, and edited on February 6 of that year. Somehow, in looking for an early instance of the expression "cut [someone] slack," he fell into a Google Books glitch-trap and repeated its erroneous attribution of a quotation that included the phrase "cut slack for others' dumb opinions" to Frederick Douglass's My Bondage and My Freedom (1855). In fact, the quotation comes from a novel published in 2001. The earliest published instance of "cut [someone] some slack" that I know of is from 1968—113 years later than My Bondage and My Freedom.
Three months ago, I added a comment to ScotM's answer, pointing out the error and suggesting an edit that would remove the mistake and leave the rest of his otherwise very good answer intact—but he's not around to make the change. Meanwhile, casual readers who visit the page in question (it has racked up 10,616 page views so far) are going to come away with a seriously mistaken view of how old the expression is and where it came from, unless they read through ScotM's long answer and my comment at the end of it and my long answer (which follows his).
At this point, should I just take matters into my own hands and delete the first 92 words of ScotM's answer? Or is it better to leave things as they are and hope that ScotM will eventually revisit the site and correct the unfortunate error at the beginning of his answer?