If by safety, you mean the myriad internal devices or trigger complications which are designed to disable the internal lockwork unless the trigger has been deliberately squeezed ... well yes, most pistols have such devices.
Still ... anyone who is "trusting the safety" is most likely violating one of the previous four rules. I believe that "don't trust the 'safety'" is one of the reasons for Rule 2, rather than a distinct fifth rule.
IMHO. YMMV.
in fact many modern pistols and rifles do not have one.
Many long gun owners know this not to be the case. Go to any firearms shop and virtually all the long guns have a mechanical "safety".
With our current litigation crazed society there is not a manufacturer of long guns that does not equip any of their firearms without one.