I don't think that is intentional; it's just the broken knockback/knockdown physics that didn't get fixed before the closure was announced.
Indeed, it's the same physics bug that caused mobs to frequently get stuck in walls/warehouse shelves like they were covered in velcro, still possessing most of their hitpoints, but being rendered unable to move...and all the while their head kept rotating Exorcist style. And limbs too for that matter.
tbh I rather enjoyed that - always gave me a laugh, especially when it's a mob that was wont to give me trouble, like a Malta Sapper. "Not so clever now, eh?" I'd laugh at the screen, watching their limbs spin around uselessly as I beat on them
*ahem*
Anyway, back on topic...
I agree that it's not a good idea to attempt to actually influence the official rating of B&S in any way - that way lies censorship and the slide towards supression of freedom of speech. Remember, ESRB/PEGI ratings are not there to affect sales volumes. The folks deciding film/tv/game ratings in any given country make their decisions based on the laws governing those countries, and as such, the ratings they give should not be determined by the "court of public opinion".
Public opinion itself, however, is freely up for grabs...
Getting the attention of vocal organisations with certain views about the kind of material to be found in B&S is not intended to change the rating B&S gets - but what it can do is change the
opinion of ordinary customers who may have been considering buying the game (regardless of its rating).
As has been said in this thread already, raising a game's rating can make it seem more attractive to folk who might fall outside of the age category listed - it's forbidden fruit, which makes it all the tastier to nibble on. That's pretty much the limit of what a changed rating would do.
To an extent though, lobby groups decrying something as "obscene", "degrading" or whatever can also have the same forbidden fruit effect, drawing attention to something that might otherwise not even have been noticed. However, the advantage of such lobby groups is that unlike a simple rating number on a tantalisingly unopened box, they can illustrate
exactly why they're so outraged.
Sure, some of the same people who wanted to see inside the unopened box might get the same naugtiness buzz out of what the outrage groups say - but the key thing to remember here here is it's
the attraction of the unknown that's the biggest pull to the curious. That's why they're curious in the first place after all! Remove the curiosity by exposing B&S as a dull game with gaudy body paint, and the appeal of the unknown is lessened.