The issues you stated are right. They should be of serious concern to everyone who is involved in the blockchain technology. But we also know that this tech is in its infant stage. As we discover challenges from day to day, we'll also rise to bring solutions to them. You wrote a post about two weeks ago and I commented that cyber security should be a thing of serious concern to everyone. Everyone should take a little time to study and understand at least the basic on how to protect his/her self from cyber theft.