Plot Said To Do It

We can't just walk around this small shrub in our way why again?

When it's valid to question why people do the things they do in fiction when there is a clear, much better alternate to those actions. Someone could be quick to answer with Plot Said So, but although that is a good answer, it's really because Plot Said To Do It. The difference between the two UnTrashes is that Plot Said To Do It has a Plot Saver reason, such as the main heroes not being able to simply walk around a large rock in their path and having to use an item to destroy it because Game Said So, while Plot Said So generally refers to previous points in the story being enough explanation for current and future events.