When I see people reply-all to someone who mistakenly sent to something like dl-employs-all get “Remove me from this!”, as a BOFH I’d like to have HR consider it an official letter of resignation. Sadly they don’t.
In the event that I'm put on an email chain, I don't know who put me there or why, and I don't want to be on that chain, I'd probably do the same thing. Why not?