it not the act of killing that makes them so..... distasteful.
A murderer can choose to kill, or not. But a Ghoul or a vamp has (generally) no choice, they must consume people to live.
Sure, some can get by on the kindness of strangers, be that donating bodies (which I really don't see happening, at least not in numbers to support a community) or people volunteering to have part of their soul consumed due to their fucked up romantic mental imagery.
A Murderer is not infectious. If a murderer scratches you, you don't suddenly grow claws and fangs, lose body hair, go blind, become awakened and then have an almost irresistible urge to eat other people.
HMHVV is the bubonic plague of the 6th world. except instead of growing pusstules and dying, you turn into a monster and eat people.
Don't kid yourself, it's been 50 years since HMHVV was discovered, and they don't have a cure, or a vaccine. Nor (I suspect) will they ever find one, thanks to the disease being awakened. In the almost 20 years since the Big D kicked the mana-hole in the sky, not a single company has found a substitute food for ghouls.... And again I doubt they will, since the prime ingredient seems to sapience and not the food stock. (hence why Whimps are not a valid food source, Whimps are not sapient. Which leaves us with 2 options:
1: Feed Ghouls regular people (be it dead, the terminally ill, condemned convicts, small unwanted children)
2: develop a new sapient species solely as a food source for ghouls.... such as actually growing fully developed clones (that are sapient!!).
Number 2 leads you back into the same moral dilemma, you are STILL killing one sapient person to feed an other.
As for #1, that is what they are doing now! (eating the dead, the terminally ill, SINless, street kids, and anything else they can catch)
Don't confuse an emotional stance for one of practically, I would fully expect a family member to do whatever they could to help an infected loved one.... They have an emotional attachment to the poor infected. But Emotional decisions are NOT rational ones. Without going too much into it, there are numerous cases of family members making ill-rational decisions for family members when an injury or illness is involved. I have had to make such a call (and it is never easy!). But family members often will go to great lengths to save the unsaveable, even if that means someone else has to suffer for their decisions. The 2 best cases that come to mind are in the first case, a child suffered a brain injury and was brain dead (zero brain function) BUT, the family insisted that the child stay hooked up to the life support systems even though there was zero chance of recovery. (It ended when the hospital got a court order to terminate life support, but they also had to have police remove the entire family has they were physically attacking the staff who were court ordered to turn off the machines) The other case was when a family got a court order to STOP cancer treatments for their 11yr old child because it wasn't "traditional native American medicine". Sadly the girl died 6 months later from the cancer (that had a 80-90% survival rate WITH chemo treatments).. and ended up before the courts AGAIN as the family sued the hospital for NOT saving their little girl and providing Chemo treatments..... Grief over the suffering of a loved one makes people do strange things.
So yes, Fire. Lots and lots of fire.
Is it the best solution? the most humane solution?
Dunno, but it does stop the infection rates if you reduce the number of carriers. And given the fact that corporations and countries can't even afford to take of actual, uninfected people (hence the HUGE amount of SINless) They definitely don't have the resources (or the Will) to care for, house, and isolate Ghouls....
Which again leads us back to... FIRE!!