Comment by steckerbrett

Probably mostly towards the end of getting a good story, two of the behaviors mentioned in this article as erroneous are somewhat intentional (though all the effects aren't). Light specifically mentions that he is making his deaths visible because he wants people to know that there is someone behind it, playing into the idea that he has gained godlike powers and will use them to change the world. He also goes out of his way to bait L to some degree in an attempt to eliminate him, believing L to be the only true obstacle in the way of achieving his end goal. With hindsight this is obviously the wrong move to make (he gave away a lot of information for no good reason), but you can see why someone faced with an invisible enemy might feel like drawing out their opponent is a good idea.

All that said attempting to anonymize his targets probably wouldn't have done him that much good anyway. As a Japanese person his sources of news and information would be at least on some level biased towards hearing about events which have some connection to Japan. Even if he was able to overcome that through the internet, people have a very noticeable habit of treating things physically closer to them as being more real than something on the other side of the world. Adding entropy within a limited information aperture only gets you so fat, I'm pretty sure he would have still had information leaking just through that lone.