High Level Programming Languages

When is it appropriate to use a high level programming language? Personally, I always feel guilty when using anything except C.

1.writing stuff that needs to be written fast: rapid prototypes, scripts and utilities for rare use.
2.Demos and concept programs, code which doesn't need performance.
3.High-integrity software: C is too unsafe for it.
C is still the lingua franca of computing. Its like Latin at this point: more advanced and precises languages exist but C provides universal basis for writing new stuff(compilers, VM, interpreters). At the root of most software stacks there is a C/C++ dependency(where C++ being dependent on C-level components and libraries)