The answer to your first question is the fact that that those are the lyrics he chose to write down to the exclusion of the many other things he could've chosen to write at that moment . . . .
What other things? Long range weather forecast? Greek alphabet? Pythagoras Theoem from first principles? Lyrics of 'Moon River'? The ability of plants to apply quantum biology to increase the efficiency of photosynthesis? Give me a break!!
Many totally sane people people keep what is known as a 'Common Place Book'. Similar to a diary but not restricted to having to be done on specific dates or concerning specific dates. Just a way of noting down a thought, an idea, the line of a poem or a quote that struck a chord. Or even the notation of a musical riff!
Many writers, poets or songwriters do this as well as regular people when something memorable springs into mind that want to make sure they remember later!
By its nature it tends to be sequential if it is in a series of notebooks; some may just be in the form of notes to oneself on pieces of paper.
Stephen King and other horror writers must all have fascinating 'common place books' or similar - they must all, by your logic, even have the potential to 'act out' any of the aspects of their jottings. Even some of those who love that genre of literature, and jot down random thoughts or quotes, must also have the potential to morph in to 'child killers'.
Most people, with any imagination, have at some time or another day-dreamed about a big lottery win and what they might then do. Maybe all suspected bank robbers should be asked, as a matter of course, if they have ever thought what they would do if they won the lottery!!
Or have we entered the age of thought-crimes now?
Your psychic abilities amaze me and I am astounded that you have not become a world's leading expert on the direct causal link between a vivid imagination and crime.
What about the links between vacuous minds and crime? By that I mean those who spend hours playing computer games that involve war, murder and mayhem?
Sorry, but using the jottings of a solitary and angst filled teen who enjoys Stephen King type literature as evidence of a disturbed murderer is just too fantastical for me. Even the prosecutors did not recognise a Shakespeare quote! And the jury were very obviously impressed with the illustration of this backwoods thinking.
By the way - should you happen to cut you self or get scratched in the future do not either suck it or lick it as that would be the same as 'drinking' it in your mind and mean that you are a potential vampire!
I must be one, as my cat, but ten minutes ago, broke the skin on my arm and it bled and I put it to my mouth!!
I respect your right to be of the opinion fixé that he is guilty but am saddened that you are unable to see that there is just maybe room for a degree of 'reasonable doubt' to creep in. But please try to use more logic and hard evidence to state your case!!