In addition, the dollar is guaranteed to be diluted, meanwhile for Bitcoin, there's no such certainty.
People having to HODL tell themselves whatever they need to to feel confident in their so-called investment. Frankly, people that bought towards the top in Bitcoin are still massively down and that lack of certainty isn't exactly a comfort.
Besides, although I tend to think of your comment painting USD in a poor light, the USD is actually working as designed; to be nominally inflationary to encourage spending and investment in productive aspects of society and business and not to encourage hoarding. The USD is doing exactly what it's supposed to do.