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*I don't know why people still insist of using Raito even though the author already confirmed it as Light
Because Raito seems more Japanese, it feels more natural, and because we're reading Japanese manga here, AND we're more accustomed to English than Japanese people, we feels like the word Light sounds and read lame you know.
Of course the author wanna emphasize that the character's name is Light because he means to use the English word in his manga, it looks and feel more prestigious for Japanese reader, thou the effect is opposite to us.
Just imagine that the author is an American and he's writing a Japanese manga, will he still emphasize that the name is Light ? If he write the word Light in kanji, it sounds like "Raito".
You decide.
*and yeah, Raito is smart, and he's the main character, so it's not wise to kill off the main character that you've been supporting since the start. Anyway, I feels that Death Note is not a normal manga to begin with, it's like a puzzle book.