Whereas reaching to greater than 100,000 year cycles is a giant red herring at this point as well. We're dealing with an unprecedented rise within less than a 100 year period, regardless of whether or not this is some "ancient cycle", it's a very frightening thing and we should very much be doing something about it. Playing a blame game at this point about who "created it" versus "sped it up" seems a bit like playing hot potato with a live grenade.
Edit to clarify: unprecedented - in our species' history, in our species' survival to date. That's a part of the focus on the last 100,000 years.