People that think bitcoin is a scam must also believe internet native decentralised digital currency is an impossibility for humanity to ever create.

If someone truly believes bitcoin is a scam then by extension they must also believe it is impossible for human civilization to ever invent decentralised digital currency.

They must think anything of value that exists has to be physical or have a centralised trusted third party to operate it, meaning they think all value must be derived in the physical world. They believe to be of any value at all something either needs to be physical by nature or operated by a physical organisation.

If this is the case and they believe these things then they must also believe it is impossible to create a decentralised digital currency. They must believe that even in 1,000 years or 5,000 years or 100,000 years humans will not have invented a decentralised digital currency. Why? because bitcoin is the only way to do it and if bitcoin is a scam then inventing a decentralised digital currency must be a human impossibility.

You have to either believe bitcoin is a real valuable monetary network and asset, or believe that it is an impossibility for humanity to ever invent a decentralised digital currency.