Right now, they have an incentive to be very nice to those people.

In fact, they SHOULD be inviting the Red Cross and mid-east officials to check up on them.

This is propaganda.

They already know that the US will torture prisoners to death.

They already know that the US will lie about its intelligence findings.

Your link is to an Iranian page. Claim that the Iranians lied.

Show the world how nice you are.

The idea is to get the citizens in the other mid-east countries so pissed off that they'll force their governments to kick the US troops out.

It's a slim chance, but it's the only chance right now.