Curiosity killed the cat?

In the novel Strange Case of Jekyll and Hyde, written by Robert Louis Stevenson,the idea of curiosity was brought up with Jekyll experimenting with Hyde. I even wrote my thesis paper on this idea because I was so intrigued by it. People will go to extremes just because they are curious about something; it's in their nature. Babies will get into everything just because they want to discover something new to them. But when does this become dangerous? When do we go too far? I always see stories about people doing these outrageous things just to see if it'll be "fun" or exciting", but sometimes it'll end really badly. There are professions (researchers) based just on the fact that they are curious about something. Scientist make a living off of this human trait, but will there be a time when they need to stop? Maybe we'll discover something that we don't want to know about, something so bad that we will wish we never saw it. The older we get the more curious we get, but is curiosity our downfall? If we did not wonder what is beyond our knowledge would we ever get into trouble? Are these the things that keep us humans going, or what ultimately end us? I have been trying to figure out if it is a benefit or determent to the human race, but I just can't decide. On one hand if we were not curious we would not be progressive, and we would be stuck in the same place. We would probably still be on a horse and buggie never realizing we could be in sports cars talking on our bluetooth speakers that connect to our smartphones. On the other hand, it could be the main reason why we as a human race are getting into so much trouble? So what is it? Did curiosity really kill the cat, or did it just help it out of a burning tree?