You know what the ironic part is? Circumcision in the past, while still a barbaric and morally unacceptable practice, involved cutting substantially less skin than today. Unfortunately, crazy rabbis did not like how many Jews in the past, particularly in ancient Greece, restored their foreskin by inducing mitosis through various methods. Basically, in ancient Greece, public nudity was widely practiced in various communal aspects, specifically gymnasia, athletic competitions, and bathing culture in later Greek and Roman periods.
In these societies, the foreskin was considered aesthetically and culturally important; it was a marker of refinement and proper male appearance. The exposed glans was viewed as ugly, vulgar, and even socially improper according to the Greek aesthetic standards. Because of this, some men used devices like the kynodesme as well as ancient restoration methods to circumvent the effects of circumcision.
To deal with that, the Rabbis added another step to the Brit Milah — which originally only involved a partial removal or a nick — called Periah, which is basically tearing the membrane beneath the foreskin, specifically to prevent the restoration of the foreskin and to ensure compliance with religious covenants. Aside from that major reason, it was also about preventing masturbation, since it was believed to be harmful to the mind.