Humans are very smart creatures, and that makes them dangerous. However, this only pertains to a few which have advanced the human race as a whole. Because of the ability to pass down knowledge, humans have been able to advance to new heights as technology is created and improved. Unfortunately, the general population is dumb as a bag of bricks.
There is no shortage of stories of humans doing dumb things that result in them being severely injured or dead. Were it not for advances in medical technology, they would be removed from the gene pool due to natural selection. Messing with wild animals that can take your head off without effort is never a good idea. This does not stop some individuals from doing so.