Earlier in my career, which is not too long ago, I behaved exactly as you've described. It was not worth the risk of seeming "difficult" or "demanding" as someone with little experience, to be asking for (ostensibly selfish) changes from my manager. It seemed much less confrontational, and often more lucrative, to simply find work elsewhere.

If the candidate was misled in the hiring process, and the organization (which is the sum of its people) is dysfunctional enough to result in that outcome, it's not unreasonable to think asking for it to be fixed may be taken negatively by the folks who put you in that situation.