Whenever you hear about Bitfinex fraud. you never hear it this way: If you issue 700 million USD of some currency, and that currency is on the exchange, surely that 700 million affected the Bitcoin price. Probably raised it.
Whenever you hear about how much of the world's electricity Bitcoin is using, you never hear how that affects bitcoin price. Probably pushes it down. After all, miners have to pay their bills somehow.
For the first, you can watch a whole 60 minutes of video on youtube about it, but the guy will never mention that that made up money will feed into the bubble. Only the fear of how will its collapse cause the price to drop is talked about. Also, once USDT gets on the exchanges and in people's hands, it can never leave.
This leaves me to the third point. It is not possible, by definition, for everyone to "exit" the bitcoin. Yes, one can sell it, but that just means somebody else has it now. Or, a whole group, like "smart traders" can sell it, but, when looking at all the people in total, there is never any "leaving bitcoin" happening. The same is true for USDT, and surelly that 700 million USDT played a huge part in this rise from 1k to 16k for Bitcoin.