In some serious SHTF event (real collapse, large scale terrorist attack, pandemic or similar) bodies will be problem, simply because increasing number of bodies simply will overwhelm dealing with them.

Mass burning of the bodies sounds like good and fast way, but keep in mind that still require some level of organization, and that is exactly what is missing in large scale SHTF.

At the end, it may come to the sad and gruesome fact that I mention before, you will be able to take care (hopefully) only for things inside your home, everything else is simply outside of your influence.
This here goes mostly for urban areas.