Why don't we have meds to treat or battle the common cold, considering we have antiretrovirals for hiv? Is the virus really more resistant than hiv?

Mortality. There is ongoing research into antivirals for some of the causes of the common cause but there are many viruses that can cause this. Because of the rapid spread of, and high morbidity and mortality with, HIV infection, there was more than adequate reason to work on the treatment of hiv.