It's not because it's a threat, it was to make it easier to catch the zebra, which has been getting spooked by all these extra people hoping to see it. There's been all sorts of folks out there causing it to panic and run away. They tried asking people not to "help", and it didn't help, so then they closed trails etc.
Talk about things to get tired of, it's people automatically thinking things are nannying, or whatever their specific anti-todays-government thing is, and then being sure to spread what they have decided something is, in their infinite wisdom, without taking even a few minutes to think beyond their immediate bias.