As far back as we have written records, we have the notion that people in past were better and more honest and the present day is corrupted.

Classical antiquity had the notion of a lost golden age and a heroic age in past, while later times considered the classical antiquity as the lost golden age. Victorians romanticized the middle ages, while we romantisize the victorians.

It is just easier to see the flaws and imperfections in the present. And there is the survivorship bias: Quality products and buildings survive, while low quality crap is destroyed and lost. The swords survive but the pointy sticks are lost. The good music survive but the crap is forgotten.