Starting a blog - Who

Who should write a blog.    We all have a choice when blogging like WHO should I be.  Should I be myself or should I be an alias, should i write from a sutffy professional point of view or should I write friendly, personable blog.  Perhaps we should just be ourselves but then again that means that some people will not like us after all for me that means miszSpelling and typoos.  With today's politically correct drive a person cannot really have an opinion because if you do that means that you are wrong in someones eyes and if you are different then they will blast you as being closed minded and label you with SOME kind of hatred.    So perhaps we should all just have no opinion and act like the mushrooms they want us to be...