Proverbs of Convenience

Sometimes, it seems to me, that a person pushing his case using a metaphor ends up creating a proverb. Like a certain Goebbels is reputed to have said, 'Keep repeating a lie and it will be taken to be the truth' or some such thing. So, what may have started as a self-serving statement ends up becoming received wisdom due to constant repetition.
Apparently, people believe that "Too many cooks spoil the broth". Looks to be quite possible, since I have never seen any two people being perfectly confident about whether the other will do what is necessary. So it is quite possible that one cook dumps a truckload of salt in the broth assuming that the other is obviously a nincompoop who cannot be relied upon to add salt. In a rare show of unity of thought, the other would do the same on the same assumption. (One of those inexplicable wonders of the human brain is that this "Two minds with but one single thought" thing applies mainly to pejorative impressions about each other). Naturally, the broth turns out to be a gourmet's delight - for gargling.
What, then, do we say about "Two heads are better than one"? Do not ask me "Better for what?" The proverb is conveniently silent on that. It seems to me that this must have been the sales talk of a number two in the organization, who has given up on the number one either retiring or dying. So, he goes with this spiel to his boss to ensure that he also becomes the 'head' without having to indulge in such medieval pastimes as assassinations to create a vacancy. No broth gets spoiled in the process, since our man only wants to get the Chef's hat and perks, but has no intent of entering the kitchen. (You have doubts? Even after all those Deputy Prime ministers and the like? I think the original doubting Thomas can take your correspondence course) As a matter of fact, it seems to me that neither 'head' wants to enter the kitchen these days, and the broth gets made on auto-pilot, thereby proving that 'No cook can also spoil the broth'.
Of course, you do have a doubt here. Why is it "Two heads is better than one" and not any more? Well, as they say "Two is company, three is a crowd" - and, therefore, we developed Boards of Directors, Cabinets and the likes to ensure that we have enough people for those rare occasions when we prefer crowds. You know the net impact of that, since "The IQ of a mob is equal to the IQ of its Lowest Common denominator" which, invariably, tends to the single digits.
And, yes of course, in any crowd of which I am a part, you know who THAT Lowest Common denominator is!
P.S : Owe this to Ilakshee's comment though she may not be particularly pleased by my (mis)interpretation!