The first and most significant is the emotional aspect. Usually if there is an emotional connection to the victim, who is likely a relative. In this case it is obviously traumatic to find a loved one in this situation. As such you are likely emotionally distraught. Another factor, while not as significant as the emotional factor is the financial aspect.
Crime scene cleanup or death cleanup as it is often called in expensive. This is because the cleanup, which usually involves blood cleanup and/or the cleaning of bodily fluids, represents a bio hazard situation. This is due to the possibility of the presence of blood borne pathogens and other potentially dangerous bacteria which are released or developed after death.
As such cleanup generally requires special expertise, experience, and equipment and so can be expensive. Finally there is the gross out factor. Most everyone has a natural revulsion to blood, viscera and bodily fluids. Perhaps it is an evolutionary thing or just due to socialization, but it is difficult for most people to be around these things let alone clean them up.
With all these factors, which make this a hard situation to deal with, it is not surprising that most people can't or don't want to deal with the cleanup on their own. As such there are crime scene cleanup companies out there such as http://www.actremediation.com who specialize in death cleanup and blood cleanup. They have the training, certifications, and experience to deal with this type of bio-hazardous cleanup.
They use specialized equipment and knowledge to clean up your residence making it safe and removing all evidence of the trauma scene cleanup event. They will even dispose of any and all of the biomaterial from the site in a safe method which meets all local and state regulations. And do it all while being respectful of your feelings and discrete, so that this can hopefully remain a private affair.
In addition to the cleanup, companies such as http://www.actremediation.com have personnel who can help you work with your home owner's insurance company to file any claims. In many cases, your home owners insurance will cover part to all of the costs of this type of crime scene cleanup.