Hackers will always be social engineers at the first place, not magicians, and will exploit human stupidity.
Bitcoin is sensitive only on bad karma. Not on brute force! Bitcoin as idea is ideal of freedom, and if they cannot take your
freedom, they will lie about it in worst ways.
Exactly, people can lose their bitcoins only in the case of leaked passwords and private keys, leakage can happen on either on client side or even on exchange side. There is no way to automatically detect password even through brute force attack. Bitcoin is stronger in such sense that it would take minimum 100+ years of continues brute force attack if your passkeys are weak so there is no chances of security breach.