For me, long term holding should not only mean “I believe in Bitcoin”. It should also mean “I can leave this money untouched for long time”.
That's what Warren Buffett said: "If you aren't willing to own a stock for ten years, don't even think about owning it for ten minutes".
But when real life problems come, like rent, medical bills, family issue, job loss or urgent expenses, many people are forced to sell even if they never planned to sell. In that case the problem is not Bitcoin, but bad planning before buying.
Another saying: "If you want to make God laugh, tell Him about your plans".
Don't get me wrong, good planning helps, but you don't know what life can throw at you. And when shit happens, you need a different plan... if you have Bitcoins, or something else, at least you have something to sell.
It's easy to talk about emergency funds, investment funds, and all other funds... but some people don't have enough for basic needs. They can't afford to think about those funds, they are too busy with life circumstances...