Why do people get used to kneading unwanted paper into a ball?

1. Knead into a ball, so that the volume of waste paper becomes smaller and it is easy to stuff it into the trash can. It's difficult to stuff a whole piece of paper in. We usually use A4 paper, so it is difficult to put it in the wastebasket.

2. Kneading into a ball can also hide the contents of the paper. If it is a whole piece of paper, it is difficult for others to see the contents easily, but if it is a mass of paper, others will not open it. After all, it is waste paper, not high-level trade secrets. If it's a secret, it's not that simple to deal with.

My humble opinion.