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If you didn't believe Bitcoins were special they wouldn't be scarce (since there are 20,000 cryptos and growing) and you'd have to admit all the irredeemable cryptocurrencies (including bitcoins) are pointless. Then you'd save precious metal.
But of course I can take Bitcoin, change the code to recognize a different Genesis block, and now you've got Bitcoin 2 and it's a new chain with exactly the same properties. If you ask Bitcoiners why this wouldn't be equally good money they give a vague dismissal involving network effects.
So there are three post-fiat positions:
1) Cryptos are all scams but I'm going to scam people. (Crypto bros)
2) Cryptos are all scams and I'm not going to scam people. (Goldbugs)
3) Cryptos other than Bitcoin - even if they have the exact same properties as Bitcoin - are all scams, but Bitcoin is legit. (Bitcoin true believers)
I don't think there's a good argument for non-fraudulent crypto generally. There's no real asset so if you just make it up on a computer, why should it be worth anything? (This applies to Bitcoin also)