No one can steal all bitcoins if such thing is possible it would be done in the past. Such thing will never happen and if someone find a way to do something like that i think he will be intelligent enough to know that stealing all bitcoins is not a good thing because they will have no value: who will buy something that can be stolen at any time?B Bitcoin is based on trust, more trust means more value.
i dont think so, bitcoin is digital currency therefore it is online so it is still prone to attacks by hackers and viruses if you are careless about using it. ive seen many reports that their bitcoins had been steal to thier actuall wallet because of phising , so i guess it can also happen to you and all of us who uses bitcoin. stealling bitcoins is a good thing for them because they can sell them to earn a profit effortlessly.
Every things in the cyberworld has its own disadvantage, even how secured it is. I know bitcoin is highly secured and how reliable it is and I believed its capability but scammers and hackers or any computer experts are possible to do something in order to downfall the bitcoin. The security of bitcoin were already anticipated those bad people and doing something better to there security. Also, as the bitcoin being part of our society, it really helps people to earn as extra income and gives progress in our country and our economy as well.