It's wrong to discriminate against fat people.
Harry has to hire a new employee for his business, and he has been interviewing candidates all day.
Harry wants to make a hiring decision.
Harry hires the candidate with the best qualifications for the job and the most experience.
Harry makes his decision without considering any candidates that are overweight, because he thinks they won't work as hard.
The new employee works out well for Harry's business, so he knows he made the right decision.
Harry does not end up hiring the best person for the job.