So that's why all of my subjects have turned from black to blue! I was wondering about that. I don't really see the point in making the subjects links when you can just click view comments or something else.

Maybe they did that because when the comments are turned off you can't get to the entry's page. ...Well, you can, but it's complicated. You'd have to look into the sourcecode and take the entry's ID from there and put it in the URL.