Isn't that exactly what blogs and blog posts are supposed to be? Personal?

Besides, it's actually a thread in a subforum whose description starts with "This board is dedicated to what you see around the world, news and your opinions." which fits rather well.

Now, whether it is HN-worthy or not is another story.

You're not sure why someone decided to express their opinion on the internet? Did you just wake up for a 40 year coma?