Re: What factors scare others from investing into bitcoin?
Many problems can be pointed. Hackers, price going down, many negative prediction about its life in future made people stop investing in BTC. 
Bitcoin or Blockchain is still very prematurely known. You lose your Private key and you can no longer access your wallet. People who bought Bitcoin at $15,000.00 and sold them @ $9,000.00 and still checking now from time to time most likely has accepted the $6,000.00 loss.
I know a friend who invested to Bitcoin when it was at it's price of $4,500.00. he invested $10,000.00 and he tried to do he calls it ( margin trading ) the last time I check on him, total value of his Bitcoin is now down to $4,500.00 the around 2.1 BTC he have before is down to 0.8 BTC now, and he still hasn't given up.