DC villain Gog argues that the existence of the Multiverse brings about more harm than good, as it leads to the emergence of villains and evil versions of heroes that pose a threat to the mainstream DC Universe.

The Multiverse offers an infinite number of possibilities, but only one DC villain's relentless pursuit of chaos and destruction has consistently proven to be more harmful than good.
Gog views the Multiverse as fundamentally opposed to its inhabitants, as he believes suffering occurs more frequently there than it does here on Earth.
The DC Multiverse is a vast and diverse realm of comic book possibilities, offering endless possibilities for writers to explore and reimagine beloved characters and storylines. It allows for the creation of countless alternate realities with unique storylines and outcomes, with each reality presenting a different perspective on the same characters and themes.
The Multiverse should possess an infinite number of heroes and perfect worlds, but the only thing that consistently emerges is a plethora of villains and evil versions of heroes. The Crime Syndicate from Earth 3 is a microcosm of this, showcasing how the very essence of heroism is corrupted when twisted by the dark side of existence. This is why Gog argues that knowledge about the Multiverse only leads to disaster, as it inevitably leads to the emergence of more villains and evil versions of heroes.
Characters from the Multiverse, such as The Batman Who Laughs and Superboy-Prime, are a threat to Earth-0 because they seek to wreak destruction due to their knowledge of the interconnectedness of the multiverse. Without this knowledge, their presence would not have posed a significant threat. While there have been instances of villains like Justice Incarnate, the Multiverse has generally served as a net negative, with characters from the multiverse consistently contributing to the fight against evil.