Varför räknas inte västra sidan av "mindre asien" till europa?

where does Europe end in the east? A famous nineteenth-century statesman and Chancellor of the Habsburg empire, the Rhinelander, Count Klaus Metternich, was clear; he took the view that Asia began not far from his office windows in Vienna. There is something to be said for that, but it is a view based on history rather than topography. It is not easily defensible (or much use) until much later than prehistoric times. To decide where prehistoric Europe can be said to end, whether geographically or climatically, is in fact bound to be somewhat arbitrary (ethnically it is impossible). There is no natural line demarcating Europe from the rest of the Eurasian landmass which gives an outline so definite as that provided by its coasts further west.

Roberts, J.. The Penguin History of Europe (Kindle Locations 356-361). Penguin Books Ltd. Kindle Edition.