Wouldn't you think there would be VHS tapes, Magazines, beside the computer zipdisks up on a shelf?
I know people will say, HE HAD xxxxxx images on those disks. Well, that is because they hold that much. It just seems to me that all men have a sexual drive throughout their life. They also have a sexual curiousity starting when their hormones go on the rampage.
They can be interested in just 'seeing' something. People SLOW DOWN to GAWK at a car wreck, at the dead bodies. Does that mean they want to see car wrecks with dead bodies every day, for hours at a time. No, don't think so.
A man could download porn onto disks, view them once or twice, out of curiousity, out of being without female companionship, many reasons. But after awhile, he must get bored with them.
I imagine DW rarely looked at or spent the time it would take to UNZIP the files and look at them.
That his son did is no surprise, and there are those that think Neal didn't look at pictures X or Y. Well, He probably did, but to admit it, to admit downloading it, would be prosecutable if it is found to be ILLEGAL (minors) PORN.
SO he admits to viewing the BIGBOOBS ones, and doesn't admit to the others.
From what I understood of the later cross (I couldn't get the trial on today, too congested) the passwords used to download the suspicious porn was not DW's.
Alexandria's #967 answers this well.
Very few men desire to see pre-pubescent females in provocative sexual poses.
Keep digging.