Meat that has "disappeared from view"

(written motzash)
Today someone told us that, in the spirit of the halacha pertaining to "meat that has disappeared from view", that some rabbi-folk want to require a mashgiah to accompany cooked foods in transit from the caterer's kitchen to the hall in which the food is being served, to ensure that the meat is being switched by the driver for non-kosher food.  

I am a little confused by this issue. For a person to switch such food, they would have to know in advance exactly what and how much foods the caterer is preparing, and prepare the same foods in the same dishes at the same time, and then pull off a switch in the time that the food is travelling; which , in Our Land is usually under an hour.  They would have to make the food look and smell exactly like what the caterer prepared.  Otherwise, upon arrival at the hall, the caterer will notice that the food has been switched, no?

Seems like a lot of effort.  WHY would anyone do this?  For the fun of thinking to themselves, "Those fools are really eating treif!!" (cackle cackle)?   Seems like a lot of effort for very little gain to me.

Anyhow, since my inability to comprehend the mind of a criminal is not a basis for halachic decision, dh researched the issue, and found that The Shulhan Aruch, on the subject of בשר הנתעלם מן העין (meat that has disappeared from view) says that the need for hashgaha on meat that is kosher, but then is out םכ view for some time, is not needed for meat that is packaged or in an identifiable form, as it would be obvious if it had been tampered with (Yoreh De'ah 63).  Further on in the book (Yoreh De'ah 118), the Mehaber says about all such issues that one only has to be concerned about someone switching food IF THE CRIMINAL WOULD HAVE SOMETHING TO GAIN BY SWITCHING THE FOOD.  Hmm, so the Mehaber thought similar to me.  That's cool.

This was fairly easy to research, as we have a copy of a book every modern kosher home needs, Rav Knohl's book ואכלת ושבעת, which deals with Kashrut in our day and age.

So, we come to the question: if this is such obvious halacha, why are "learned rabbis" demanding hashgaha for this?

Well, does anyone have anything to gain by requiring additional hours of work for mashgihim?   

Is it possible that any "rabbis" have friends or relatives who could then get (more) jobs as mashgihei kashrut?

Scary to think that people might abuse halacha for such purposes.  The other option is to think that there are "rabbis" who have never learnt Yoreh De'ah.