Well that's too bad for them if they think that warning sign are just to annoyed them?
Like the morons who climb a electric pylon to "cut" copper wire and don't think the loud buzzing sound is a warning, they die of electrocution since its high voltage, its not the 120/240 in your house. Its more like 750 volts and more.
"I just want to take a close picture of the tiger" Well Its a wild animal, they are not statue nor pet. Move away from them!