Does invention of virus and antivirus in computer is neccessarry ?

The worldwide use of computer and internet from rich to poor

seems so common and become a petty business. The invention of virus and antivirus can be a part of indirect collection which kept along with the free adult website . The accidental visitor paying the price by taking the bytes.When the website itself is open to all ,does putting virus to control viewers is neccessarry ? Personally I am not interested with such website. But thanks to AVG for helping such viewers.

Does invention of virus and antivirus in computer is neccessarry ?anti virus scan

And yet another idiotic answer from chrishdman. How about this: you try to hack my ***. Why don't you just find out my IP and then hack me? Oh wait...my PC has a firewall that's rated for Fortune 500 company servers! That might do something! (note there is no such rating, I mean my firewall is one used by very large companies).

To the intelligent asker:

The reason they put viruses is twofold:

1) It's just plain damn amusing

2) If the virus/hijacker keeps taking you to a porn site, look at the site for a while. Let everything sink in. See those ads everywhere? Every time someone sees those ads, the porn company gets paid. That's why they keep redirecting to their page so they get ad money.

The virus itself was invented as a practical joke. However, back then, there were no laws to regulate something like that. So people go it into their heads that they could screw around.