A rhetorical question really.
In my case, it's really just an exercise in trying to put my feelings down in words, and if it provokes comment or discussion so be it.
A lot of the time I suspect this will be some form of reaction to a news item or somethingthat's caused me to think about something that would normally be trivial in my daily life.
There's been many people giving reasons not to blog, some citing that there's no point in subjecting the rest of the world to your own drivel. Drivel or not, being able to have your say is something some people do not have the opportunity to do even in this day-and-age.
So I will re-iterate something that Arthur Wellesley (once the Duke of Wellington) is attributed with... "Publish and be damned!"