If you don't understand the risks, you don't understand the costs, you're likely to get the trade-off wrong, and your feeling doesn't match reality. Not enough examples. There's an inherent problem with low-probability events.
Si no entiendes los riesgos, no entiendes los costos, es probable que tomes una mala decisión, y que tu sensación no corresponda con la realidad. Ejemplos insuficientes: Hay un problema intrínseco con eventos de baja probabilidad.