You have things to say. You have ideas. You have statements.
You want to get them out. To broadcast them.
You want to know how to reach people and connect with them.
You want to get over your fear of doing it in the first place.
Come to think of it, on your job, chances are you wish you were better at shooting your mouth off effectively.
A blog is a great way to get better at this.
Blogging is a soap box you can stand on and shout from.