The very anonymous nature of the web allows them to behave very badly and get away with it. With the scripts to do the work for them, they can trash people and systems, vent their anger, and feel very powerful indeed. They invade the chat rooms, send out Trojans, and generally trash anyone that they feel like. While good security can prevent most of their attacks, the newer DOS attacks are work of these scripts, and they cannot be prevented so easily. The smarter and somewhat more skilled have used scripts to set up shell accounts on secondary systems to hide their tracks.
Real hackers despise the script kiddies.
The kiddies are not hackers but just program users. Kiddies are only useful to the hackers in that they point out just how weak security is on the net when a bunch of no nothing kids can bring it to its knees when ever they want to. The wannabes start out by modifying the scripts that the kiddies use and slip right by most standard security measures. By the time they reach Elite status they are writing their own scripts. Once again it is the shell account that allows them to hide their tracks so well.