1. A lot of rich people bought probably at 40.000 and 30.000. So many of them will very likely do lobbying and marketing to keep the price up.
They are not all-powerful, there's only so much they can do to influence the market. And it's not even a fact that they would want to keep Bitcoin above certain level, maybe they actually want it to go down to buy even more?
2. News and future events should be already priced in, except a black swan.
And how does this mean that Bitcoin won't go below $40k?
3. Way more people seems to be very bearish, now. Even a lot of big influencers. Some of them are calling 20.000 $ - 16.000 $.
In most cases the opposite happens from what the masses think. So it`s likely that Bitcoin stays above 40.000 $ and is moving up, soon
This is basically the idea of Fear and Greed index, but if you look at such charts, you can notice that there were periods of Fear followed by even more price decline, or Greed followed by more Greed. It's really not a good basis for predicting anything.
There is nothing that guarantees that Bitcoin won't drop below $40,000, but it doesn't matter, it's just another psychological barrier, there's nothing fundamental here.