On FARK.com (a sometimes NSFW ad and link website) folks post links to news stories with clever, usually snarky, headlines and then the site members comment on the stories (and the posters and so much more, it can get brutal).
Anyway, there is a steady contingent of folks outraged that (first) they didn't use tranq guns instead of killing the activly attacking tiger and (later) that zoo staff had gone to get the guns but the police took charge and took away the tranqs. The timing is sketchy on whether the staff got to the non-lethals
prior to the police finding and killing the cat, or if they got them on scene too late.
Remember when the police were notified it was thought all 5 cats might be loose, lots of confusion.
The commenters on the sight are often naive and in the case of many of the "poor cat/bad killer cops"-types prone to 20/20 hindsight.
Lots of eco-hippy "but, but, tigers are endangered" (yes Virginia, in the WILD they are) or, "better the tiger was saved and the taynting humans die", though you can see the smoke from some of the non-gaia worshippers as they attempt to reconcile the value of pretty, endangered, kitty life with human life.
There are of course a few folks who point out tranq darts do not equal phasers set on stun in terms of instant effect.