Those who know bitcoin and are interested in investing in it, know for sure the pros and cons and what he is planning to do and I'm pretty sure he know everything about it, and we have nothing to do with what they choose to, they just believe bitcoin that's it.
Of course those who know bitcoin well and are aware of bitcoin advantages will never choose anything else, now a day bitcoin has good progress and it is rising high in price, as volatility is the best advantage of bitcoin that most of people to sue to earn money. Apparently I think bitcoin has no such disadvantage, in forum advantages bitcoin is secure, volatile, decentralized and anonymous currency so because of all these advantages we use and invest in bitcoin fearlessly.