Never is a person more vulnerable than when they're going to the bathroom. This means that it is very important to have the most comfortable place to do it. Unfortunately, not everybody seems to think that way. There's an awful amount of awful toilets out there and it is a damn shame we all have to put up with that.
However, some are far worse than others. There's a difference between your restroom break being mildly unpleasant or a full on nightmare, and these examples completely cross the line. Everyone poops, but not everywhere is a particularly comfortable place to do it.