Regardless, the null position which assumes the least is not "crypto currencies run by folks seeking to exit into USD provide real value" but rather "do not provide value".

The claim that someone would prove, of course, would be that they provide value.

So that shouldn't offend you that the null position (and the position which satisfies occams razor) is the default stated position.

Instead of criticizing it, you could actually do the work of proving your claim that crypto has real measurable value to a society. Until that's proven, though...