There are days where I'll spend a lot of time planning a blog post in my head. It'll be full of fire and passion because that's how I get about my opinions. When it comes time to actually write and post it, my energy for it fades.
I don't think it's that I feel less strongly about the opinions over time. I think that it's like I've already had the experience of getting those emotions out, so I don't feel the need to by the time it comes to write it.
It's an interesting experience.