If people start to don´t trust Tehter, they are able to sell a bit under 1 usd price. And price USDT / USD can drop for example to 0,97, how can Tether cummunity return value closer to 1,00 if drop to 0,97 happen for example in all bigger exchanges and all their pairs?
Ideally, those people who are still trusting Tether can redeem their USDT for the pegged 1:1 price directly to Tether.