Srimad Bhagavatam, Mahatmyam, Chapter One Sloka 62:

Shri Bhatkiyurvacha…Hey Muni (Narada), people are interested or prone to commit sins in Kali. This Kali is an ideal candidate for getting killed. Then why did King Parikshit protect it (Kali). When Kali made an entry on earth, where did the soul of the earth go?

Interpretation: The story of why King Parikshit spared Kali comes in later chapters.

Srimad Bhagavatam, Mahatmyam, Chapter One Sloka 63:

Karuna.How does even a kind-hearted Sri Hari not do anything seeing Kali who is wedded to adharma. Please answer my doubt, hey Muni. Hearing you I get a lot of peace.

Interpretation: Each Yuga has its own traits which even Srihari – the Supreme Lord – cannot change. Not that he cannot, but the message is that He does not want to alter the rules. What should not be changed should be left alone. But then, in Kali, one can seek protection from the afflictions of the Yuga through devotion and Satsang (being in the presence of devotees or gurus). The Yuga is ordained to show its nature, but through nurture (the right environment) one can seek solace.