Let's view it, as Don S. said, comparing sin to dog poop.

As Don put it, if we set down our soft drink, and a dog poops in it ...we wouldn't want the soft drink anymore.

We wouldn't exactly meter out the amount of dog poop that fell into the drink ...we wouldn't want the drink if it was a lot, nor would we want it if it was just a tiny bit.

I'm not asking anyone to make "keep off the grass" their mantra ...nor am I trying to give you the latest 'scoop'.  We do need to concentrate on what is important, but if the concentration of poop is too strong, the grass may burn.

Yet, with a good rain, the grass may turn green.

(Just corresponded with my friend, Don ...and he said his story used bird poop, not dog.  In tall grass, I like boots on the ground ...but, it's harder to defend against an aerial assault.  He said my story had the right sentiment, though my sediment was slightly off.)