"I'll never understand why they acted so creepy and suspicious in the beginning"
They really didn't. I followed the case pretty closely.
They replayed the video tonight where Patsy seems to be on tranquilizers, and she breaks down at the end telling people in Boulder to hold their babies close because there's someone out there. Makes you really want to cry now.
And the Boulder police gave their citizens the "all clear" as far as a sex pervert/murderer being on the loose.
That's really a crime.
Only caveat might be, and it's a stretch, but I always had the feeling that they knew who did it, but were either too terrified to admit it, or completely blocked it out.
You just named all the creepy things they did.