Do this:

1. Create a table and add some content.
2. Select several cells, e.g., an entire column.
3. Decide that you want to get rid of this column.
4. Oh, look! A button marked "Delete" appeared when I selected this column. That must be the way to delete this row, right? (It's not 'Properties' or 'Merge', so it must be the other option...)
5. Oops.

Maybe the message should say "Delete table" for clarity.