In Jurassic Park Operation Genesis you had the option to pick up visitors from dinosaur enclosures by helicopter, so if somebody accidentally ran into the enclosures while evading dinosaurs breaking out you could rescue them even after you fixed the hole in the fence. In Jurassic World Evolution so far i found no option to save people from enclosures after i fixed the broken fence through that they got in, so they just stand in the enclosures until a dinosaur kills them.