Speech on school going children are lazy and disease prone?

A speech about children going to school being lazy and disease prone could include communicable diseases spreading from one child to another with many of them becoming sick, and children not doing their homework even though the majority of them getting their homework done and turned in on time, or other issues.

Of course, you would want to back up your points with references to reliable sources. You would also want to practice your speech several times in order to use your voice and gestures to help make your points and keep the interest of your audience.