Actually Lasz, they are part monkey....far better able to climb the metal bars of a zoo fence than is a tiger, whose claws are good for only climbing large trees and killing prey.
Some accounts quoted on the news state that the young men had climbed to the top of the fence. I didn't make that up. A taller fence might have saved them, but as stupid drunk and doped up as they were, there's no guaranteeing that they wouldn't have tumbled into the enclosure.
Bottom line, they'd still be alive if they hadn't been competing for a Darwin Award.
Sure, the fence could have been built taller, but as good Republicans, we should also believe in personal responsibility.
Regards, Shuckins