When I was a snot nosed kid about 35 years ago, I got involved in some petty theft. One night a friend and I picked a lock and walked into a room with four adults waiting for the same perps who had already been pilfering items. We weren't them, but these guys were certain that we were.
I picked the lock. As a young kid I learned how to pick the easist of locks, the older ones. It was mostly the idea that I could figure it out and do it that drove me. On this night I picked a really old door lock. Most old timers know how easy the old time door locks were to pick. The old wing of the school had ancient fixtures. The new wing had modern Sladge locks. I didn't know them from Adam, but these guys were convinced that if I could pick on, I could pick all.
The mentality behind the Westerfield photos seems like the same thing to me. Westerfield has lots of photos, thereby he's a perve. Sure he's had that computer for a couple of years, but he just had to be a full time porno abuser. They were positive.
From my own experience I have seen how some investigators jump to conclusions. Yes the data seems to confirm what they say it does. But alternate explanations also do. Westerfield may have used the computer in the day, his son at night. Who knows which of them accumulated the majority of the pictures. A young kid with raging hormones could have responsible for most of it. In one evening he could have easily downloaded 500 small photos without hitting the download key once.
I don't know. I'm just not as comfortable with the public prosecutor's explanations as I'd like to be. So much for that.
Take care. BTW, I hope you uncover enough material to slam the door on homosexuals who prey on school kids.