I would exepct a PETA or Earth First terrorist to strike visitors to a zoo.
If concerned about politics and I are correct, the hangup this person has is about hunting. And, you know, it's hunting season in many parts of the country about now.
Also, consider where this is happening. Not far from the nation's capitol. A prime place for an activist to live.
This could be way off, but, heck...it's as least as lucid as what most of the idiots on the talking head shows are saying.