Indeed. Presumably extreme weather events were in existence before humans were here to experience them, and they will continue to exist so long as the Earth's surface is heated unevenly by the Sun. But which events would have happened anyway, and which are the result of some new element(s) accounted for by the theory in question?
In fact - if we are unable to distinguish the former from the latter - is the theory in question refutable by any conceivable event?
There was such a bad hurricane season during the Revolutionary War that the French navy sailed back home in tatters, refusing to port there again in that time of year.
If you argue a modern tornado proves global warming, then extreme hurricanes in the 1700s (by extension) disproves it.
https://www.goodreads.com/quotes/7434469-a-theory-which-is-n...