[ferrouswheel]

If you know anything about neurology or psychology, you'll know that there is no "objective perception". There is science, but that's about repeatability, and the complexity of geopolitics makes situations difficult to reproduce in exactitude. We make assessment based on different sets of experiences and knowledge, and our perception is influenced by our past and present.

No two people have the same life experience.

The very rawest form of perceptual subjectivity can be demonstrated by the interference of vision and sound caused by the McGurk effect. Search youtube for an example.