Part 133 External Lift…….  

Just curious, looking at FAR 133 and the AC for 133 operations I don't see the "daul hook" system mentioned as a reason not to need a CAP. The regs and the AC does talk about what a congested area is and isn't and the general requirements for a CAP. I haven't worked with a dual hook system so I simply don't have any experience with the rule which negates the requirement for a CAP.

The reason most operators preach about overflying buildings, homes, busy intersections etc. is that, regardless of the FARs, if you drop a load and it destroys property or people the operator, and perhaps the pilot, are likely to be held to some level of legal and financial  responsibility. The easy thing to do is just avoid property or people when possible.