That is insane! I'm with Steph, let's start a poo police force!! I would shudder at putting a pooey disp in the bin, though I know that is exactly what MIL and my SIL's do. And they think I'm the cranky one...?!
For me, I turned a point after labour when I was no longer shocked by gore and bodily substances!! Really, there is no getting away from it with babies. My son was in disps as I knew nothing about cloth 10 years ago and there were some really evil leakages from those, with mustard splatters up to the neck and all over the clothes.
How do these people cope, they must pick the baby up with tongs and hose them down.