It's not that Red Bull made a carbon copy of Ferrari's front wing; it's that they copied the
concept of Ferrari's front wing.
And why not? A wing with an effective span that extends beyond the end plates increases downforce by way of additional surface area, and it narrows the gap between steering input and "wing response," for lack of a better term.
In other words, it's the best of both worlds.
I imagine Ferrari's recent "correlation issues" have hindered their attempts to fully exploit the potential of the concept, because it relies heavily on very complex interactions between the wing, wheels, brake ducts, etc, etc. But, that says nothing whatsoever about the prudence of the design.
Ironically, Ferrari and Red Bull have "swapped" end plates this year.
RB9
F14T
So, even if I had no understanding of the rationale for either design, it doesn't make much sense to me that Red Bull would adopt Ferrari's concept if it wasn't a better solution, as teams never willfully regress from year to year.
Whatever the case may be, I don't know that I can say much more here without repeating myself. I guess you either see it, or you don't.
EDIT: As a note, I wholeheartedly agree with the following:
“Simplicity is a great virtue but it requires hard work to achieve it and education to appreciate it. And to make matters worse: complexity sells better.” ~ Edsger Wybe Dijkstra