Okay , if we dont know the identity of the creator how can we know the true purpose of creating BTC in the first place?
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Why would you need to know the identity of a creator to assess the "true purpose" of its creation or ideas? I don't care who invents something good or interesting, unless those creators have proven to be deeply evil in the past.
Have you even taken the time to read the Bitcoin Whitepaper? What do you think was the reason for the cited headline from The Times newspaper in the Bitcoin genesis block?
Satoshi Nakamoto likely didn't like what common crooked financial systems and their supporting crooked politicians and governments were doing. He had the idea to create something which is trustless, safe, point-to-point, decentralized and governed by math and energy (proof-of-work) solving crucial problems that digital money prior had. Good enough reasons for me.
Oh and btw Bitcoin is still safe after more than 15 and a half years and with a total market cap of around 1.26 trillion $$$ at present.
If you're not a lazy duck, here's some material to read and learn from:
Wei Dai/Satoshi Nakamoto 2009 Bitcoin emailshttps://satoshi.nakamotoinstitute.org