pesky pathogens

i've done a bit of research, aka googled, human pathogen life-cycles. i'm surpised to find that most don't live more than 1/2 a year at room temperature. so, what's the fuss about compost that's sat for two years?

from this site: http://oikos.com/library/compostingtoilet/pathogens.html:

Typical Pathogen Survival Rates at 20° to 30°C in Various Environments*
Pathogen	Freshwater and Wastewater	Survival Time in Days**
		Crops	Soil
Bacteria
Fecal coliforms***	<60 but usually <30	<30 but usually <15	<120 but usually <50
Salmonella (spp.)***	<60 but usually <30	<30 but usually <15	<120 but usually <50
Shigella***	<30 but usually <10	<10 but usually <5	<120 but usually <50
Vibrio cholerae****	<30 but usually <10	<5 but usually <2	<120 but usually <50
Protozoa
E. histolytica cysts	<120 but usually <15	<10 but usually <2	<20 but usually <10
Helminths
A. lumbricoides eggs	Many months	<60 but usually <30	<Many months
Viruses
Enteroviruses***	<120 but usually <50	<60 but usually <15	<100 but usually <20

* Adapted from Feachem et al. (1983).
** Includes polio, echo, and Coxsackie Viruses
*** In seawater, viral survival is less, and bacterial survival is very much less than in fresh water.
**** V. Cholerae survival in aqueous environments is a subject of current uncertainty.