It appears to me that this explanation of "People who live in glass houses shouldn't throw stones" is incorrect, or at least, ambiguous. That people shouldn't criticize a fault that they share themselves is not given in the 'story', and it suggests that the saying is instruction about hypocrisy, which is supported by the 'see also' association. However, it is my sense that this is also a commonly understood interpretation and use of the saying, leaving this entry hanging between what it means as a story, and what it means as a cliche.