Tire Pressures

What tire pressures should be run with newer radial tires. I am running 32lbs but when I read the post about tire pressure labels I saw that it was only supposed to run 24lbs if under 5 passengers. I am concerned that that could ruin a modern radial tire.
For all loads up to full rated it dos state it does state 28 front 30 rear.
I think the lower pressures were to create a soft ride Just like the super aggressive no feel power steering.
Author: 67 ragtop