This is important for a number of reasons, and I have too many to list here. In addition, each person who signs this petition may have his or her own reasons for doing so.
The single best reason though, is also one of the simplest - and that is taste. Lime compliments Orange, Grape, Lemon, and Strawberry well. With the real Original Flavor Skittles, you could pour a few into your hand and each them as a bunch. The flavor balances would vary, based on what you had, but the combinations were all palatable, even tasty.
Now, with "Green Apple" in the mix, that is no longer the case. Green Apple throws off the balance of the other flavors, even when it is outnumbered by the remaining real Original Flavors.
For further reaction, see: