Therefore nothing we can do will have a truly permanent effect, as the final state of the universe will be the same regardless. Assuming that to be the case, are you really indifferent between being kicked in the shins and not being kicked in the shins, since the universe ends up the same either way?
I wrote my reply to this (long) but meh, I'll let it sit overnight before posting so I can review it again (with semi-fresh eyes).
Also, on a more personal level, even if the universe doesn't die, you will...
Tyler Cowen argues in a TED talk (~15 min) that stories pervade our mental lives. He thinks they are a major source of cognitive biases and, on the margin, we should be more suspicious of them - especially simple stories. Here's an interesting quote about the meta-level: