I'm not saying the brothers are good people. All kinds of people, even idiots and drunk no-goods go to the zoo, however! Zoos are open to the general public, so they should have protocol to follow when the visitors are taunting animals or just being disruptive in general. This zoo had such protocol, I'm sure! (Short of feeding disruptive visitors to the tigers, that is.)
It is interesting to note that Tatiana had marks on her back paws that indicated that the escape was NOT the first attempt to get out; she had tried before. On those previous attempts, we don't know if she was provoked by drunks, babies crying, the weather or just a desire to get out.....if she had succeeded on a previous attempt, we might have had a dead child or family, instead of a drunk young man.
The zoo knew ahead of time that the enclosure was not up to standards. They KNEW the enclosure wall was not high enough; no proof was needed! Even being knowledgeable about the proper standards, they did nothing to fix the situation until Tatiana escaped and killed someone. IMO, it is because of the inadequate enclosure that Tatiana is dead. It is sheer LUCK on the part of the zoo that the victims were unlikable people, because if Tatiana could get out to kill one human, she could have gotten out to kill ANYONE.
editing to add: It does suck that the tiger had to die for just being a tiger. The zoo should have done a better job of protecting both Tatiana AND their visitors.