This springs from the many comments which over the years I have heard from adolescent students that appear to reflect the views of their supposedly upright and moralist parents—people who in spite of their religious affiliations nonetheless believe that since the triumph of corruption is inevitable, it is just as well to join the corrupted and profit by it.
I think most rational people would consider any "entity that stops at nothing to succeed" an inherently evil process, a type of thinking that has justified some of the worst atrocities seen in the last 2000 years
attributed variously to Machiaveli, Neycheavov, etc. helps explain it, but is not an answer.
Pragmatic does not work for obvious reasons.
The expression should describe the philosophy that allows for this type of practice. It is a darkly pessimistic attitude that assumes Evil will always triumph: like a juggernaut, the overwhelming power of corruption will always defeat the upright and moral.
Please no evangelistic religion-based answers.