Hackers can't have access to your funds unless it's your mistake. About uses of bitcoin, bad people will use anything secure and untraceable and they will exist if there is a bitcoin or not.
Yes, bitcoin is really do can secure future lives. Bitcoin is such a great transaction that ables many people to help many things. Bitcoin is really do secure and help many people to learn new things and make their life better. Bitcoin is safe and even if it isn't that stable but it helps many people learn new things and learn on how to be patient if you really want to risk everything for you to become successful. People cant hack this transaction because it is too safe than others.