A fuse sometimes is a very important element. If your circuit is attacked by some high-energy-impulses, the only thing which becomes disturbed is the fuse, and thats the only reason why the fuse exists - for its death. Sad but true. But isn't it true of all of us ??
In real life, everything looks different. Every single circuit has just one aim: To protect and to serve. It protects the fuse from blowing and helps the radio shack dealer to gain money by selling you another fuse-saving circuit.
Hmm. This was easy - BUT ...