Bad design can have dramatic consequences. It will not be too hard to convince readers of this blog of it, but in the population at large, it’s not as obvious as it looks.
This short video by Vox makes that point very well, with convincing evidence. They start with the latest iteration of bad typography with the Oscars’ blunder, then get into more serious stuff, just watch it.
The Oscars example.
The confusing voting form that may have changed the course of a presidential election in the USA.
The form as redesigned by a graphic designer in order to avoid mistakes.