Computers Doing more harm than good?

When I was his age, I had no access to computers and video games. However, my younger brother has access to all that the internet and all that computer can offer. Yesterday I was very shocked to find my younger brother viewing naked pictures on his computer and before I could shout what was that, He had already deleted everything from his computer and was able to deny in front of me that that wasn't naked pictures but just some background pictures he tried putting as his desktop background. He was able to deny but I know for sure he was viewing naked pictures and there is little or nothing we can do about this situation because even if I cease his laptop, he can still get access to computers outside the house and I am getting worried that one day he may decide to go in for pornographic movies. Just the other day, I saw him playing some adult video games and when I confronted him, he said that was just a video game. I know computers help kids to study and computers help scientist and business men and women to carry out their day to day activities successfully. I know this is the computer age and that there is nothing without computers these days but my question is; are computers doing more harm than good? For example, people are relying so much on computers these days that they sometimes forget to use their brain power. Calculators do all the calculations these days and many more.. What do you think? are computers doing more harm than good?