What is that on a per-capita basis?
On a per-capita basis, per 100,000, the common denominator used for comparing relatively rare events, that comes to:
In 2018, the US had 327,167,434 people. Germany had 82,800,000. Do the math and it comes to 0.3 per 100k for the U.S. and 0.005 per 100k for Germany.
Admittedly, Germany's rate is 63 times less than that of the U.S. However, while 1,000 is nearing the bounds of statistical relevance, 4 is simply not enough data to reliably compare to anything. Furthermore, Germany's population is significantly more homogeneous than ours and must better trained with respect to following the law, including respect for the Polezei.
Finally, there's the training of the Polezei itself, also different than that of U.S. law enforcement, particularly with respect to threat response.
The the real stickler is the number of deaths per 100k in the US: 0.3 per 100k. That's tiny. Just 3 per million. Sure, you can detect 1 ppm of chlorine in your water, but Cl is a highly reactive chemical. 3 people per million is minuscule when it comes to all causes of death.
One must also examine this in the light of numbers of police contacts. The U.S. Department of Justice, Bureau of Justice Statistics, "Contacts Between Police and the Public, 2015," states there are 21.1% of persons age 16 or older with any police contact. That's roughly 60 million contacts.
1,000 deaths out of 60 million contacts is 1 death in 60,000 contacts. Again, we're looking at minuscule numbers, just 1.75 deaths per 100,000 contacts, very low on the rather long list of causes of deaths, most of which originated from either traffic stops or response to reported or possible crimes in progress.
Bottom Line: Comparing Germany and the U.S. with this measure isn't likely to yield salient results, as when it comes to respect for and cooperation with the police, German citizens are vastly more cooperative.
I like it in New Hampster. Friends there. Don't like the biting black flies, though. Heard they're wicked bad for about six weeks out of the year.
BJS report:
https://www.bjs.gov/content/pub/pdf/cpp15.pdf