How do you know it will always recover? Yeah, it usually does, but there's always the worry of that one time it doesn't. If a bubble does happen as many people are panicking or worrying about bitcoin could easily drop by several thousands and it will have a knock on effect as more and more people start to panic and get out as fast as they can and dump their coins. Bitcoin has already lost a few thousand in value in the space of about a week and it could continue to lose much more. I believe bitcoin can bounce back but like I just said, there's always that time it doesn't or it takes all year to recover like what we saw when bitcoin fell from 1k to a mere few hundred dollars and took quite some time to get back to where it was. This can always happen again and bitcoin is never going to be a sure thing.