Why it is unethical to create computer virus?

Computer Viruses can do damage to people's computers. They can destroy important data. This can have all sorts of affects, from personal inconvenience through to disrupting the operations of major organisations and vital services. The creators of these viruses may get their kicks or some sort of "buzz" from doing this, but they are achieving nothing positive. Many of those that write viruses are highly skilled computer people, who unfortunately use their talents in a negative way. They are in effect a form of technological vandals. Their work may not be as evident as those doing things like breaking Windows, damaging public property or theft, but they do have negative and often far reaching consequences. So creating computer viruses, like any other sorts of needless vandalism and criminal activity, is unethical.