From my understanding, this comes down one thing basically - most of the script kiddies
arsenal starting life
originally as something else. Most of the time as something that actually had a legitimate
use as a defence
tool eg Packet Sniffer
And if it's not the original product that they're using then it has most likely hacked up by somebody who doesn't really have any idea what they're doing and consequently ends up screwing the nice piece of software that someone else spent a lot of time on.
On the other hand, do you really want script kiddies to have access to real software used for this purpose? Of course not! But what they've got makes them feel special, but keeps them from causing any real trouble.