If only I had held onto my butt.
What the hell? Even smaller theme parks like Disneyland tend to have more security, just to keep toddlers from getting mangled by the Country Bears robots.
Why Some Extra Staff Wouldn't Have Hurt:
Instead of breeding more attractive, popular and harmless dinosaurs, John Hammond thought it might be a good idea to breed super-intelligent (and apparently pure evil) velociraptors, despite the fact that they would hardly have been an attraction since before 1993, only paleontologists and guys who regularly read the dictionary knew what they were.
Even stranger, they also don't appear to be part of the park's tour, and are instead quarantined to a Kafkaesque holding pen, where even just a brief sight of them feeding seems to be enough to cause Jeff Goldblum to completely lose his appetite.
And he's not easily sickened.
So when things unexpectedly turn all Westworld, it might make sense to have some guys with guns handy. In fact, the only person on the entire island who seems to have access to a gun is resident mercenary Robert Muldoon.
Of course, the whole thing could probably have been sidestepped if Denis Nedry hadn't spent all of his time eating Butterfingers, installing viruses and downloading fetish porn. Sure, this stuff happens in regular offices every day, but Cracked headquarters aside, workplace laziness and hijinks usually just lead to perfect fodder for an international sitcom phenomenon and not carnage, terror and children with permanent psychological scarring.
All of which could have been avoided if they had just hired enough staff for a regular zoo, with maybe a few extra to account for the fact that no human has ever worked with these animals before and you have no idea what they're going to do.