First we'll debate if Bitcoin is a Ponzi scam.
Next it'll be whether there's any non-criminal use case.
Then how it's not "real money".
Please, won't some very intelligent dude please educate us all about Dutch tulips?
I see the constant rehashing as a byproduct of the fact that the same old topics get reposted over and over again as they resurge in relevance.
I see this as a byproduct of crowd consciousness. Not everyone is going to see a post before it dips out of sight, so it's bound to pop back up again eventually (if it becomes relevant again), and then new people will see the second/third/fourth postings.
As such, the same rebuttals have to be posted over and over again, so that the new audience has contextual information.
It's not an easy problem to solve.
Bitcoin started with its value essentially at nothing, and the early "investors" were able to create tons of it out of thin air.
Provided they held onto that Bitcoin, the "value" of the "currency" only increased as more and more people bought into the notion that it had value.
You can see how this would heavily incentivize early investors/miners/buyers to perpetuate the scheme.
Many early "investors" in Bitcoin made millions of dollars off of their gambles. I personally know quite a few of those people.
I hate to pull the wool away from your eyes, but that's not a deflationary, stable currency. That's a Ponzi scheme.
You can make this argument for any created product, especially any currency.
"out of thin air"
Yes. That is currently how most currencies work.
If the US government fails so spectacularly that the US Dollar loses value, do you honestly think that the internet will even be working at that point? And without functioning internet, there won't be anyone mining bitcoin, which means that control of the blockchain will be easily seized by whoever has control of the largest mining pool. This would very quickly result in complete devaluation of Bitcoin (but not before whoever took control would be able to cash in a LOT of money).
If we had truly decentralized peer-to-peer internet (think ham radio over mesh with millions of portable devices or something) with truly peer-to-peer DNS and full encryption, and no centralized control, then MAYBE bitcoin might have a chance if the government collapsed. But we don't. So (at least for now), the idea that Bitcoin would function as a viable currency in that scenario is a giant joke.
It's true that the US Dollar is inflationary (while Bitcoin is "deflationary"), but that is by design to drive economic growth. Simulations (and history) have shown that with a slightly inflationary economy, people are more likely to spend their money instead of holding onto it. This causes a constant cycle of spending and earning, driving more goods to be created, and causing more people to do more work.
Deflationary economies, on the other hand, often result with the economy stagnating (because people are more inclined to just hold onto their money instead of spending it). You could argue that this is better (because people like the idea of their money gaining in value over time), but to make that argument, you would have to prove that economic growth is a bad thing.
As to the idea that it isn't subject to whims or political stability, I would argue that one merely has to look at the history of Bitcoin's price to prove that statement is false. Bitcoin's price is highly reactive to political news and random whims of the market (as well as manipulation by bad actors).
I'm not saying that crypto-currency doesn't have its place. I'm just pointing out that a lot of the fundamental principles that people swear by when it comes to Bitcoin are flawed.