Ibiye and His Goat

There's an adage in my local language that I've probably heard a handful of times but never really thought much of.  Seemingly out of nowhere, I started to think about it and I think I finally understand it.  Picture this: There's a blind man named Ibiye.  Ibiye owns a goat, which also happens to be blind.  The adage describes Ibiye's goat as being the cause of much abuse or insult to its owner on account of the fact that it's blind, just like it's owner.
Doesn't seem to make much sense at first perusal, right?
Well if you consider that in the same language, the exact same sentence could mean 'you blind goat' or 'you blind man's goat', then it begins to make a bit more sense.
So, if there was a son of an alcoholic dad who got drunk one day at a family meal and someone said 'what a drunkard'!  Who would you reckon they're referring to?  
As with most Yoruba proverbs, the meaning of this one is multi pronged.
On the surface, it may mean something akin to 'those who live in glass houses should not throw stones'.  It could translate roughly into: If there is already a propensity towards some negativity in your life, do not do anything to perpetuate that notion.  I know! I know!  That last sentence goes against everything I know about writing and speaking but I'm going to let it stand.
On another level it says to Ibiye: because you're blind, to most people, your goat is never going to be anything more than the goat of the blind man, no matter what great feats it accomplishes.
To the goat it says: were you not also blind, at least your blind master would have one good thing in his life, one thing to be proud of or happy about.
Essentially, it's saying to fathers, mentors, and all people in the superior position in any relationship to set worthy examples and to keep their image untarnished so that their misdeeds do not reflect negatively on their protegees; and it's saying to all children, protegees or all people in the 'junior' role in such relationships to ensure that they do not repeat the mistakes of their superiors.  Chances are that they may have been able to make said mistake on their own without anyone making to much of it, but given their superior's record, the conclusion , justifiable or not, would be that 'the apple doesn't fall far from the tree'.
So there's the lesson, whoever you are, watch what you do lest it reflect poorly on your loved ones.  Afterall, the evil that men do does live after them.