There's definitely some truth to what you say but I don't think it is entirely that. I do feel there are some people who truly believe what they are saying and that's only natural. It would be alarming if everyone involved in bitcoin thought the price would go up indefinitely. Even having only been here for less than a year I've already seen how this happens and how doom and gloom are used to manipulate people. I can only imagine how tiresome it must be for those people who've been around much longer.
Of course there are even really good traders who believe we could go down to 5k and lower.
But that doesn't mean, that it's going to happen or that you should listen to them.
Even the best traders are more often wrong as one may think. However these guys are not shouting out the doom into the public, just in trading groups where they are hanhing out with other traders and discussing possible outcomes etc.
The guys we're generally talking about, who spread all that "Bitcoin is done and goes down to 1k or lower", "it's a fraud and will fail" yada yada, use social media and MSM just to influence the newbies and small investors in this space. So in that case it really is 99% FUD and the attempt of manipulation. And often it works out as many people react very emotionally.
If you know that and can resist, you just watch it happen and wait for the opportunities to buy more coins when others are freaking out. Or just wait for the price to reverse and do nothing.
But hodling isn't easy. It takes time to learn and withstand all that created FUD and selling pressure. But over the years you recognize all that stuff repeating again and again.