Inconsiderate

Why are people inconsiderate? Yesterday I had set up 6 interviews for a part time job. Out of the six, only 2 people showed up. Why did the other four even bother to send a resume if they had no intention of showing up to an interview? If they had a change of mind, do the right thing and call to cancel. Luckily, the two women that did show up were very nice and I decided to add more hours to the original job so that I could hire both of them. Maybe there is a high unemployment rate because no one really wants to work.