Was this their neighbors roof? I thought that they checked all around the house early on and found no branches or such that touched the house.
I think, iirc, that the comment was that nothing was found which could make the noise they heard at Morgan's bath/bedroom window. I think they also checked and found that there were trees located in close enough proximity to other areas of the house (maybe this one?) that could rub up against the house. And they did, at one point, clear their property of branches and bushes, and were considering a "clear cut" of the property, but decided against it.
I further recall (again, if I recall correctly) that LE said there was no way anyone could get on their roof, discounting the aspen tree. And I think they still believed that LE knew everything there was to know, and was advising them well. That thought has now changed, but I don't think they can be blamed for listening to LE at the time, you know?
It's one thing to have experience with a stalker (as some of us apparently have had) or to understand it through case studies here at WS or other places online. It's another to have it be their first experience, and seemingly not terribly savvy about security, or home defense; facing this situation, they trusted the guys in uniform...and didn't do the police work themselves (like we would have done).
As for the photos, ScotsPaddy, I see what you're saying, but disagree with your conclusion. I did shoot semi-pro for a while, and it's actually fairly easy these days to shoot really nice, "artsy" photos, with cameras that are little more than point and shoots. I shot with a Canon, had some L glass, and got some amazing photos...and did self-portraiture a bit, too. It's possible...and Morgan seems like someone who loved the arts, and would have taken some unusual photos of herself...
Best-
Herding Cats