It's like the difference between not wanting to rip off a band-aid and not wanting to have had ripped off a band-aid. Sure, once the thing is off you don't mind, but actually pulling the darn thing off is just the worst. Now expand that band-aid out to your entire existence. I mean, I'm betting you wouldn't like it if I came into your room and smashed up your computer, right? Well death is smashing up your computer, your house, any friends or family you have, everything you've ever learned, liked, disliked, and the capacity to even know what any of that is. That's a lot to lose all in one instant.