Some do. Not many.

He paid all of them before making the video

Of course Iran is going to take every opportunity they get to make the US look like the untrustworthy assholes they have proven themselves to be.

Living in a nice society is all the motivation people need.

You might want to read up on the bystander effect. You do the dishes because no-one else is going to do it. But as soon as there are others who can do the job people will just stand around and let other die before they put in the effort.