The thing that is often ignored when looking at Autobahn accident stats is the position of Germany.
You're either going to Ireland, IOM or staying within the UK if you use the UK motorway network.
There is basically a requirement to go through Germany if you wish to go from one side of Europe to another.
I'm not sure why that would have any bearing on the accident statistics. If you mean "there are more accidents because it's busier", because it's distributed I doubt it is busier than say the M25, but if it is you could use a "KSI* per vehicle journey" statistic or similar, and it would still be far, far worse than the UK.
In the UK if you're a bit inattentive and go into the back of a lorry at 70mph it's going to hurt (speed differential 24mph). If you do it in Germany at 120mph (a typical Autobahn speed in the premium German cars), a 64mph differential, pretty much no such accident will be survivable, and you're more likely to because long stretches of the Autobahnen are 2 lanes each way, and those that aren't are often windier and less well developed than UK motorways.
I really think the case for them not applying the near standard 130km/h (about 80mph) limit most of Europe uses is very weak indeed. It is indeed like guns in the US (and in a way has a similar effect).
You could then mandate the installation of a non-overrideable 130km/h top speed limiter on all new road-legal cars sold in Europe.
* Killed/Seriously Injured.