It's about clear communication - "The panda eats shoots and leaves" versus "The panda eats, shoots, and leaves."
Communicating well means YOUR ideas get across better and are taken more seriously.
And whether you like "nazis" or not, how you communicate also tells people what to think of you. In the same way, there's nothing wrong with tattoos - but if you have them over 100% of your body, it may prove hard to get a job as a fortune 500 CEO.