However extreme events become more extreme. We are now seeing extreme events that simply would not have been possible without global warming. For example the 2011–2017 California drought was the most extreme drought in at least 1200 years. And yet, here we are again in what's shaping to be an even more extreme one. And going forward, droughts like this one are going to become common.
This is the beef* I had with Cliff Mass when he said the June heat wave in the Pacific Northwest had nothing to do with climate change, it wasn't an extreme event, it was just natural variation. The temperatures may not have been more extreme than known outliers, but what he didn't say is much more important: How often would natural variations lead us to expect events like it and how long would they last?
You can't just say "oh, this is just a typical thing that happens once in a hundred years" when it's happening every year.
* I have lots of other beefs with Cliff, but they aren't relevant to this discussion.
Those numbers are extreme enough to make me question whether the model's tails are heavy enough, but yeah. It basically wouldn't have been possible without global warming.
Most likely because people don't know what they're talking about. There are a lot of potential causes, probably some more that never come up, but an awful lot of absolutely certain theories.