Virus Logic

What is the point of rabies and HIV killing their hosts?

If the premise of most living things is to procreate, then what is the rationale of a disease/invading organism doing when it kills the host ?..which would ultimately lead to it's own demise !..Surely this serves no long term purpose at all !

>>1
Rabies has found a decent pathway by making its host unafraid of danger / crazy. It attacks or is attacked enough to propagate.

HIV obviously doesn't even need to do this for it to propagate.

Why do you think genetics follows reasoning? It is imperfect, random numbers emerging on solutions.