Mistakes were Made but Why Weren't They Forseen?

I love Jurassic Park. The movie was fantastic and the book was even better. However, I saw the movie when I was 9, and I didn't understand the deeper implications of the movie. I was a kid, I liked dinosaurs, 'nuff said. Now that I've read the book, and I know exactly what happened, I have one question. WHAT THE HELL WAS JOHN HAMMOND THINKING? I mean, seriously? They were cloning carnivorous dinosaurs for some super zoo. They made precautions, electric fences and such, but they really didn't think things through. They assumed everything would work out perfectly as planned. For such brilliant people, they didn't think of the less ideal outcomes. They didn't consider what would happen if the T-Rex escaped or if the raptors got out. Muldoon had the right idea, he wanted firearms, not just tranquilizer darts. He wanted LAWS. Light Anti Tank Weapons. He didn't get them. And when the T-Rex got out, they had nothing to disable it with. They hit him with 3 tranquilizer darts and he passed out 30 minutes later. A tranquilizer that would stop 5 elephants barely took down the T-Rex. And they had nothing to defend themselves from the raptors. In the movie, they had shotguns. In the book, they didn't had anything. Over half the staff died to the raptors. Thats a lot of law suits, and surprisingly the economists or the lawyers didn't consider injury based law suits from dinosaurs.I don't know why. Maybe I'm ranting, but to me it seems that these brilliant minds should have considered the possibility that events don't go as planned. The combination of deadly carnivours, a tropical island, and electric fences is volatile. Considering that the only thing keeping the dinosaurs from the keep is the generator, which, big surprise, failed. And people died. Mistakes were made, alot of mistakes were made. But why weren't they forseen?

What he wanted. /\

What happened because he didn't get what he wanted/\