Why don't we have space bending zero point energy craft yet? We know how they work. The US obviously has them its a well known fact.

They've been to the moon and mars. My theory why they haven't went further is they dont have the oxygen or the tech to navigate further.

Rockets will never be suitable for travel across the stars and everyone high IQ knows this.

Politically speaking, Why hasn't this technology been made public yet?

The technology in reaching the stars effortlessly is not in rocket tech. Look and develop elsewhere. Research zero g vacuums.

On a fundamental level it won't work because of many factors. Rockets have a limited supply of fuel, they are one way vehicles with no speed