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Also, let's compare it to cash. Bitcoin is currently worth more than $15000. How much energy is spent to create this in bank notes ?

Or compare to banks. How many people do you need to provide an office for with all the associated cost so that the structure can create $15000 ?

Banks safeguard your deposit and offer significantly more services than Bitcoin.

A better comparison to energy usage would be other distributed computing systems.

Bitcoin is insanely wasteful by design because it's requiring clients brute force guess the hashes in increasingly rising difficulty.

Computational work in cryptosystems of the future would ideally provide useful work that provides value other than brute force hash resistance.