I think it’s a cultural thing. Even when the father was appealing for information he mentioned that for anyone who did not trust or want to talk to the police that they could call him directly on his cell phone.
What a strange idea to have regarding Canada. I have to wonder why someone would choose to live in a country where they think the police cannot be trusted! I think the police would be tremendously thankful if the volunteers assisted with the investigation rather than wandering around strip malls and other buildings looking for a child who entered, but did not leave, the park.
It's also surprising that the family claimed that they did not see CCTV footage from the restaurant of Ariel entering the park when we know that they met with the restaurant to view their CCTV footage. Were they already so determined to believe that Ariel was abducted at the parkade that they did not look at people entering the park?