Based on the laziness gene buried deep in their blood, humans often tend to simplify the logic when thinking about complex issues and opt for the most straightforward and brute force method to arrive at their answers.
For example, poor academic performance is definitely due to a lack of effort in studying, or lack of proficiency in the subject matter;
Or, if a witch gives you a bottle of water, she must want to have your babies;
Or, if a pet goes missing at the school, it must have been captured by some demon, and so on.
While these conclusions cannot be said to be wrong, a closer investigation would reveal that they are not sufficiently comprehensive and fair.