In reallity, the vurnirability for a worm or virus to get into your system is created by true techs that really looking to protect you and their equipment. In order to get the fastest corrections these codes are sent to the various software inventers and writters so as to CORRECT a problem within the program(s). This code is then sent to the IT departmentas all over the place so as to research the pros and cons...at this point is when the code is rewritten to attach itself so as to be traced to find any other issues and the likes...This is when some moron gets a hold of the code and makes it react differently so as to be distructive. this is then enhanced again and again by
children that think they know something but don't have the maturity to properly use the knowledge...Thus the term "script kiddies". For these are the ones that use the information they have gained maliciously against someone else. Then you have those with some perverted notion or misconception about something trying to "get even" and all that.
Then comes the true criminals that use this information solely for illgotten gains.