Why do some people use the restroom and come right out without washing their hands.?

The majority of the people I noticed doing this is men,but women do it too. The bathroom where I work is located in the office. All the men who work there go right in and right back out. I worked at a restaruant where one of the waitress went in the bathroom and did not wash her hands. The bathroom in the front did not have a sink and she came right back out to fix food. It just boggles my mind why people feel the need to flush and run.