Actually in reality most of people who fear to lose will not learn because they're scared to take a risk. When you're fear to lose your money, you will be very careful and you wouldn't leave your comfort zone. Just like someone who's start a business, there's no business will always make money constantly everyday.
Yes, mate you are right fear can lead to not taking risk but looking to the other side if a newbie who are coming to the crypto space has zero knowledge of cryptocurrency and how it work, Bitcoin, and the Blockchain then how can't be hunted by the fear. I think for the newbies fear is the best thing that prevents them from Losing money. If he has sufficient knowledge then I think at that stage fear is also beneficial for him like you said in the post when you fear Losing the money you will be very careful with that and that's good for a newbie at the beginning. Everyone has their thought but if we have a little fear of Losing money we will control ourselves from greed and much more.