there is three fairly straight forward probable reasons
1. the challenge ( a lot of people like to solve puzzles)
2. simple dishonesty
3. malicious intent ( a lot of sick people out there )
Malicious (evil) people create computer viruses.
Creating a computer virus is unethical because viruses do things on people's computer's without their permission. Creating and distributing a computer virus would be like using their computer without their consent. Also, depending on what the computer virus does, you could incur a number of other ethical problems - like stealing, harassment, etc.
get on the computer
There could be many reasons. The computer could have a malfunction and accidentally create a virus. Or, a person could create a virus and send it to you through an e-mail, an ad on the internet, etc.
no because a virus con kill your computer
WikiAnswers does not provide information on illegal acts, such as writing computer virus programs.
Computer + virus will give you hacker.
no i have got loads of toolbars and i have not got 1 virus yet just carry on and do it do wot Eva u want with toolbars they wont create virus's
The people who made computer virus are unkown.
It is generally considered unethical because computer viruses and other malicious programs harm other people's computers, which are other people's property. They also can violate other people's privacy, and also that you are accessing their computer without their permission.
Only possible positive effects are software companies that can kill viruses are very profitable and create jobs for bright young people.
A regular virus can infect people and animals and it causes sickness. Computer viruses do pretty much the same thing, except for computers. They can cause your computer to do things that you would rather not have it do, such as transmit sensitive information to other people or crash.