I can’t imagine an atrocity that cannot be justified by the mindset of who cares, we’re all gonna die anyway. Literally, think of something that you would have a problem with doing it if there’s no need to put any weight or importance to anything because you’ll end up dead in both cases. You can’t find a single example that can be an exception to this rule, because there isn’t.
You only live once, so why not do epic shit, and also why not do horrible stuff, because why regret anything. I told you guys, nihilistic worldviews and postmodernism have leaked and seeped into every aspect of our lives and philosophical positions, even in self-help.
If something generates enthusiasm or motivation through the lack of meaning, or importance, then whatever positive effect you can get from it will not be real. It will be delusional positivity. And it won’t help you long-term.