As said sticker was shaped and colored like a traditional target for firearms, I'm gonna go out on a limb and guess what the Sticker Applier meant when furiously attaching the hate missive to the toilet paper dispenser:
Kim Kardashian--your days are numbered.
And you shall meet your end via a crazed animal rights activist who is presently stalking the Sparks Hall women's lavatories.
It's the only possible conclusion.
And one that I vehemently support.