This never made sense to me. Back in freshman/sophomore year of high school I was pretty dumb and a little "grey hat" (just exploring, really). I would spend my spare time writing stack buffer overflows and of course had an Administrator account password to every computer in the network. Why would you do something so trivially traceable to you? I tended to do things more useful and under the radar like install CVS for my CS class.
Why would you do something so trivially traceable to you?
Mostly because I didn't think it was a big deal. I mean, I changed the default homepage, I wasn't trying to format the drive or actually do anything that could be considered harmful. I didn't feel like I had to hide what I was doing.
It's not like when I took "keyboarding" (it's like typing! but on computers!) and had to type some long paragraph 20 times. Typing it once and then copy-pasting 19 times was more "wrong" in my book.