<human>: So I was out in a pretty modern place that has shops, a movie theater, and restaurants.  They have a trolley system that takes you from place to place (if you don't feel like walking) because it is so big.  
I was on the trolley with 5 friends, two of which are quite attractive.  A few minutes into the ride, a man who was 3 or 4 rows ahead of us began to awkwardly stare at us for about 15 seconds.  We were all really creeped out but we didn't really do much about it.
When I got home I was reading the newspaper and the police sketch of a serial rapist/murderer was on the front page.  They looked identical.  
The next day, one of the attractive girls contacted me and told me that she thought there was a rapist/murderer staring at us.  We thought this completely without knowing each other thought he was a the rapist.
We wrote down our seperate descriptions of him and then called the police.  They told us they couldn't do anything with our information.  The place we were at is very modern and I know for a fact they have security cams.  Why would they say they can't do anything with the information if they could look at the cameras and see where he was headed and what he looked like?

Can you provide a brief rundown of the text in within 3 sentences?
<bot>: Saw a rapist, police say they can't do anything with the information.  Why is this, cops/detectives?