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All the people responding to you are missing the distinction too... They can create/destroy coins at will. They say that they only do this when customers receive/withdraw fiat but we all know that's not the case and they aren't truthful about it.
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Tethers are supposed to be backed by $1 in assets. You're complaining that dollars are created out of nothing - they're not, of course, but even if they were: When Tether holds less than $1 of backing assets for each $1 of USDT in circulation it's worth strictly less than the $1 you're deriding. It is this gap we're talking about. So your comment isn't just wrong, it's completely irrelevant and a distraction from a real problem.
Dollars enter circulation when they're borrowed. They leave circulation when the loan is repaid. The value of a dollar is derived from the obligation to repay the debt that created that dollar, and the legal system which enforces these contracts. Banks undergo rigorous audits so we know for a fact how this works and that this works.
Banks are backed by the FDIC which in turn is backed by the Fed, you cannot have a bank run anymore. It's not possible. As such fractional reserve isn't a meaningful risk to depositors.
Tether has no lender of last resort. $.80 of backing reserves for $1 of USDT doesn't mean each person gets $0.80. It means the first 80 people get $1, the last 20 people get $0. Tether has also never been audited.