A healthy dose of scepticism is an essential trait for anyone nowadays, It is being nurtured by the ever-so-growing ocean of information that people need to navigate somehow. Scepticism is a tool that should be used in order to not get lost in that ocean. Don't use it at all and you will get lost, overuse it and it will get you nowhere. Moderation is the key.

Just remember that the type of people you describe are the ones that regret not investing in the coins the most