“It might not be dangerous with this spell, but it’s a good habit to get into for future spell designs. Start with a fraction of the power needed to activate it and then work your way up slowly. Once you’re sure the construct is stable, you can test it at full strength.” “You knew that would happen, didn’t you?” accused Will. “It was a fair bet, but this was a safe spell for accidents, and accidents are the best way to learn.”
By Michael G. Manning – Secrets and Spellcraft
In many cases it is better to let people learn from their own mistakes than to fix them before they happen. What we have to watch out for is how big the consequence is of the failure and if there is time to fix it. As a father when watching my kids jump, climb and play I often see them on they way to hurting themselves. If I feel they might break a bone then I will stop them but if it will cause some pain or a bruise it is better that they learn consequences and assessing risks.
It is the same at work. As a leader or coworker you shouldn’t always stop someone from failing. Sometimes it is the best way to learn, both from what they did wrong but also from dealing and fixing the outcome of the failure. And if they can’t fix it themselves then they will have to practice asking for help.