Agreed, this has repeatedly been one of the biggest failings in communicating the reality of anthropogenic climate change.

Climate change is not a single event, nor a cluster of events, that occur(s) over a summer. Strong hurricanes have occurred well before Dorian [1]. So have heat waves [2].

Extreme weather happens. The change in the frequency of (some) extreme events can be attributed to anthropogenic climate change, but a single event cannot.

[1] https://en.wikipedia.org/wiki/1935_Labor_Day_hurricane

[2] https://en.wikipedia.org/wiki/1936_North_American_heat_wave

Yeah, if you get people used to that kind of argument, get ready for absolutely zero belief in global warming next time we have a cold winter preceeded by no hurricane.

Also because correlation isn't causation. An instance of a hurricane or a warmer summer by itself doesn't prove anything. That's poor science journalism. You need trends and models to demonstrate climate change, not an instance of undesirable weather. It's not like hurricanes or warm summers never happened before.