Mainland Chinese society at all levels is thoroughly corrupt and its pretty much impossible to achieve what a reasonable observer would recognize as a materially successful life within the PRC without being actively involved in corruption.
Even simply to muddle along and live hand-to-mouth, content to have most of the doors to success either closed to them from the get-go or slammed in their face, a regular Mainland person has to turn a blind eye to a steady stream of illegal, unethical, and downright harmful behavior on the part of their peers.
That's a part of why (along with many other factors) many Mainland citizens are eager to emigrate to pretty much anywhere that's not the PRC.