In the physics lab the T.A. will yell at you if choose a scale that starts at zero instead of a scale that shows only the relevant section. When the T.A. is tired, he/she will ask another T.A. to continue the yelling. (Or sometimes just make you redo the report until you choose the correct scale.)

The research journal have a similar policy.

For some reason people in the Internet don't like it, so a solution for a blog post is to show both graphs. One that starts at zero and other with the relevant section.