When the market collapses, there there will be panic situation among the investors this is natural. In this case, whales or big investors always try to be safe. Thousands of big investors have lost what Luna did a few days ago. If a stable coin ends like UST, it will have an effect on the market. Investors are now thinking about the same that has been done in the market with Luna. If there is any doubt about any other project, they will withdraw their money from it, this is natural. but I don't think there will be any such problem in Tether.
The difference between whales and us is that they have money they could lay back towards, whereas we do not have that. Imagine a situation where someone makes 30k a year in the USA, that person is a poor person, it would be SUPER rich in my nation but in the USA that is not enough. And this guy managed to work in UBER for his excess time, basically have no life left, and use all of that to buy about 50k dollar worth of bitcoin recently.
Same period but we are talking about someone who has 1 million dollars income yearly, and he invested 50k as well and has a lot more left in other stuff. Which one of them would be able to feel relaxed when bitcoin goes down? Simple answer, right?