Why would nature produce something like the dinosaurs?

T rex needed about 1,000,000 calories every week... That means that it can't afford the thought pattern of other animals today... It was just a vicious killer, who did nothing but attack, and kill. A like a bioengineered killing machine who was capable of nothing else but killing. The herds of big sauropods cleared entire landscapes of its vegetation in the matter of hours or days. The other herbivores were also killers to protect itself. Who would want to walk around with a mentality like that, or revolving around that, 24/7 ? :P
Answers

JimZ

I wouldn't look at it that way. Nature didn't "produce" it. It evolved into what it was because it succeeding in filling a niche. There is some debate about how predatory it was but I tend to think it was an active predator as you suggest. What is the real difference if 20 lions kill 20 wildebeest or one T rex takes out one triceratops.

Smeghead

They survived and reproduced. The end. Anyone looking for further or deeper meaning will be disappointed.

Bob

Because they were capable of surviving back then. There must have been quite a bit of food running about.

MARK

Nature did not produce dinosaurs in the way you imagine. Evolution simply does not work like that. If something changes in a species it gets put through the testing process that is natural selection. Dinosaurs were around for a very long time and they did not go extinct through natural selection but through a major catastrophic environmental event. They clearly passed natural selection's testing.

Elaine M

Nature abhors a vacuum.

Ray

T-rex had one of the most powerful olfactory systems nature ever produced. It likely was an opportunistic hunter who scavenged on the regular.

Anonymous

I suspect they were much better suited than you give them credit for given dinosaurs existed for about 180 million years.