One of the few exceptions is when you get a swoop and squat - someone changing lanes into your path and not leaving you with enough time/space to be able to stop.
Tynan, what specific behaviour and post # are you referring to? I think you must have mixed up topics, or misinterpreted a post? The only thing I can guess you're referring to is to not admit liability at the scene of the collision, which is fairly standard advice. That doesn't mean covering up the facts and being anything other than totally honest when speaking to your own insurance company.