Germany. You NEED to arrest him BECAUSE of the nazi history. Never again means never again. Not arresting him means now you're accountable for 2 genocides.
As a former colonial power and during WWII, Germans committed at least 2 genocides.
There is a major difference between committing a genocide and watching/minorly aiding another nation committing a
genocide. I'd argue that German influence on Israeli behavior is minor—but that's admittedly conjecture.
Around 70% of the German populace are currently against delivering weapons to Israel (according to Körber Foundation). There's a disconnect between people and government at times.