Really? An outcast? Tell that to all the friends with whom he went camping, Rv'ing, and playing in the desert with sand toys. From the testimony given at trial, DW is a pretty normal guy with pretty normal interests: RV's, women, pool parties, backyard BBQs, etc.
No evidence has been presented that he ever looked at any of the child porn found on his SON'S computer, nor that he even knew it was there.
Contrary to your assertion that there are "lots of motives" the prosecution seems to have been unable to come up with even one credible one. The "porno" one was shot down.
Got anything else?