USDT have rumors it has evil hands involve in this stable coin also US government has concerns about this coin so it is safe to use USDT?
Most people consider USDT is safe because most choose USDT as their stable coin, the most liquid and pairs on the exchanges. That's the bad thing on USDT since it's not 100% backed with the real USD and there's a case where USDT can be frozen even inside on your wallet. But many people doesn't really care with that since they're not the one who face that's case, in the end it's not safe since it has a risk.
Choose the decentralized stable coin aka DAI as the alternative.