If you're merely questioning whether Tesla's really do crash into emergency vehicles more often that would be expected, I get it.
But "Tesla's on AP get in these crashes about half as much as vehicles in the general fleet" is unsupported; even in Tesla's own figures from https://www.tesla.com/VehicleSafetyReport the difference between AP and non-AP Tesla's isn't large enough (for me anyhow) to actually draw any conclusions from, since AP usage is obviously correlated with road conditions. To be clear: I'm not saying it's at all obvious that AP does worse than a human driver, but it's neither is that possibility ruled out by anything they've posted there - Tesla simply choose to present statistics without the context required to interpret them, likely because it suits their marketing aims. News at 11.
The human instinct to retain control even when that's not to their advantage gives me the hunch that it's more plausible that the apparent numerical benefits of AP are simply due to selection bias; people turn it on in situations that are less messy, and therefore it's involved in fewer accidents. Perhaps these investigations will reveal more.
Put it this way: if autopilot actually were better than a human driver, and humans choose to use it in less dangerous situations, and those drivers at least sometimes pay enough attention to catch the occasional AP oversight (better isn't perfect!) - well, then I'd expect the AP crash numbers to be dramatically lower than the human crash numbers. They're not.
I do think the Tesla AP numbers look less bad than they did a few years ago anyhow, to be fair. I just don't think it paints a clear picture yet.