Based on human logic, if a parasite kills it's host it is also harming itself. Tapeworms then appear to be "perfect parasites" because they cause very few symptoms in the host and are therefore able to shed eggs at will. But, diseases like antibiotic-resistant tuberculosis or viral cancers do kill their hosts, so logically does it make sense that a parasite kill it's host instead of finding a common ground upon which to exist together? Does it depend on if the parasite is shed to the environment after the host dies? Do you think human behavior, such as the distribution of antibiotics influences the evolution of the virulence of the parasite?