Going by your post, the most guilty party moreso than bitfinex or Tether is in fact the US treasury and centralized Reserve banks everywhere, since they institutionalize the rule that sub-banks only need to have 20% of their "IOUs" redeemable with the other 80% allowing to be made up out of complete nothingness. That is, in all logic and obviousness, outright fraud. Why do you choose to direct your ire to Tether when it's a much lesser scam?
It's quite simple, if they are printing money out of this air, they are doing EXACTLY the same thing as the centralized players you described.
It is crazy that nobody yet could audit the existence of real dollars behind Tether and all we have are just the claims that those dollars exist.
Ah, this is actually an interesting aspect of the "tether scam": take all the bad rumors that you heard about tether and try to apply them at dollars or euros... the result is very funny :-)
You can apply it to dollars and euros. There are plenty of companies that have audits published on their euro or dollar deposits - but now Tether is refusing to do so.