Saying you would 2 box in Newcomb’s problem doesn’t make sense. By saying it aloud, you’re directly causing anyone who you can influence and who would later have an opportunity to casually cooperate with you to not do that. If you believe acausal stuff is possible, you should always respond with “1 box” or “no comment”, even if you would in reality 2-box.
Saying you would 2 box in Newcomb’s problem doesn’t make sense. By saying it aloud, you’re directly causing anyone who you can influence and who would later have an opportunity to casually cooperate with you to not do that. If you believe acausal stuff is possible, you should always respond with “1 box” or “no comment”, even if you would in reality 2-box.