as old as sin

if a farm has an infestation of rodents 

that eat many of the crops 

then the farmer tries to kill as many rodents as possible 

so if the farmer kills 90% of the rodents 

and then the farmer relaxes 

and thinks that most rodents are dead and will never recover 

but then the remaining 10 % of rodents will reproduce 

and become a population as large or larger than the previous population 

and those rodents will have evolved to camouflage better 

to avoid being killed 

if failure to kill rodents continue for too many generations 

then the crops could go extinct 

if a farm has an infestation of parasties 

that feed on livestocks 

then the farmer tries to kill as many parasites as possible 

so if the farmer kills 90% of the parasites 

and then the farmer relaxes 

and thinks that most rodents are dead and will never recover 

but then the remaining 10 % of parasites will reproduce 

and become a population as large or larger than the previous population 

and those parasires will have evolved to camouflage better 

to avoid being killed 

if failure to kill parasites continue for too many generations 

then the livestock could go extinct 

if a civilization has an infestation of unrighteous 

that abuse others 

to weaken others 

in order to strengthen themselves 

then the civilization tries to lure out 

and murder as many unrighteous as possible 

so if the civilization murders 90% of the unrighteous 

and then the civilization relaxes 

and thinks that most unrighteous are dead and will never recover 

but then the remaining 10 % of unrighteous will reproduce 

and become a population as large or larger than the previous population 

and those unrighteous will have evolved to camouflage better 

to avoid being killed 

if failure to murder unrighteous continue for too many generations 

then the population of the civilization could go extinct