The complexity of range ecosystems, human influences, market variability, weather, and individuals decision making skills results in varying degrees of risks and management success and failure.
Risk is defined as the chance of injury, damage or loss, often expressed as degrees of probability.
Mistakes will be made regardless of your education and experience because no one can accurately predict the future, but you can reduce the impact of mistakes by recognizing warning signs, by planning for such events ahead of time, having extra resources to utilize during times of crisis, etc. Natural human behavior is often the culprit, we want to believe everything will be OK, then when it does not work we blame nature or others rather than assume responsibility and improve our decision making skills. A management problem is not solved if immediate profits are purchased by endangering the long-range health, perhaps even the survival, of the company. A decision is a judgement. It is a choice between alternatives.