I matter to me. I like existing. Even with the bad parts.
I am an arrogant sod, but why should I think anything like a Universe spanning Deity would care whether or not I ate pork today? Or own a dog? Or whether I worked on a Sunday?
Good enough. I like having you here, if that matters. But given your statement that why we are here doesn't matter, then you can't really call it irrational if someone else doesn't like hanging around through the bad parts. True, things might get better for them, but they might not. It's not fun any more now, and it doesn't matter anyway. How could that be irrational?
I am an arrogant sod, but why should I think anything like a Universe spanning Deity would care whether or not I ate pork today? Or own a dog? Or whether I worked on a Sunday?
On whether you eat pork - unless you're Jewish I don't think He does. On owning a dog, I don't think He's ever opined on that, but you'd better treat it well if you do. On whether you work on a Sunday, it's actually Saturday, and He cares about that for your sake, not His.
Aren't there some things you make the dog do because they're good for the dog, regardless of whether they matter to you?