  It is common folklore that semiclassical arguments suggest that in black hole
evaporation an initially pure state can become mixed. This is known as the
\emph{information loss puzzle} (or {\it paradox}). Here we argue that, if taken
at face value, semiclassical gravity suggests the formation of a final
singularity instead of information loss. A quantum strong cosmic censorship
conjecture, for which we give a rigorous statement, supports this conclusion.
Thus, there are no reasons to expect a failure of unitarity in black hole
evaporation or for any quantum gravity theory that can `cure' singularities.
