The potential difference across a wire is directly proportional to the amount of current flowing through the wire as long as the temperature and pressure are kept constant.
Say point 'A' and point 'B' are connected by a wire 'W' of resistance 'R'. When R decreases the current 'I' through the wire increases. A time may come when the current causes an electrical fire and results in damage of the circuit.
Now let us assume that A~you and B~your good friend. As long as there is sufficient resistance between you two the amount of current in the wire connecting you two will not be enough to cause damage.
I wish there was a fuse I could fit in somewhere... Resistance hurts it makes life difficult. But it has to exist and we have to control it. Science cannot give us reasonable explanations for why things are the way they are. Biology, the brain structure, psychology. We follow them as blindly as people believed all 'knowledge' before renaissance. We need something more substantial we need an individual opinion that can cause a lot of controversies but can eventually result in answers to problems no one has found the solution of as yet...