They pay huge amounts of taxes to Germany in VAT and employment taxes. Their income taxes should be paid where they are based, Germany is trying to double dip here. Apples accounting for where profits are located has to be approved by tax authorities.
The point is that they don't pay those taxes where they are based either.
Additionally, they create some value in Germany (a small share but still large on Apple scales). Taxing income derived from that is not double-dipping.
They are the largest US taxpayer. They are the worlds largest taxpayer. They absolutely pay taxes where they are based, and where they aren't based. Their worldwide tax rate is 24.6%, one of the highest in the world.
