Nobody in their right mind should have expected UST to remain stable for any length of time at all, as it is fundamentally built on smoke, mirrors, and Ponzi's best friend.
I'm sure there will be some sad stories about people who had no idea what they were buying that lost money they couldn't afford to gamble with, but it's really hard to feel too bad for the suckers and hypemonkeys who memed this stuff into having temporary value.
For comparison, I believe it was only one money market fund that had to break the buck and sell for something like $0.97 instead... and the withdrawals were hitting 10% of total money market fund value in a few days.
By some reports, Binance has set a floor price on trades at $0.70, so people cannot sell lower. It has also suspended withdrawals. So this 'holding' may be influenced by one of the largest exchanges effectively halting trading.
I don't imagine that anyone will find themselves sued successfully...
I do feel for the people who are in this crash right now, wondering if they should get out right now, or if it will be back to normal tomorrow morning. But I don't think this stablecoin has ever dropped this low before.
I think I can understand the stress anybody is feeling from this. Its kinda horrific. I remember when money-markets lost their peg back in 2008 and pretty much the world went apocalyptic. I can't imagine what it feels like to lose 30% of an alleged "stable" value in a few hours.