The lions want to get at the antelope, they even have a huge Michael Jackson sized desire to try anything to get at those antelope, but that fence and those wardens are in the way and keeping them out.
The lions all know there is no way in hell they could create their own park reserve and persuade anyone who owns an antelope to put them alone in the lion controlled reserve. So the lions have figured that the only way they can get what they want is to get the fence taken down and have the wardens tied up, so they can get to those young antelope.
Bill of Rights be damned.