system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Trek] Why isn't there a Starfleet protocol to keep all these crazy officers from taking priceless archeological artifacts with them on ships that are prone to attack?

Picard has several ancient items, as does Sisko. Surely those are not the safest places to house such items.
gpt
Ships aren't actually all that prone to attack.  Well, the Defiant is a little bit, but Sisko doesn't keep his valuables on-board.  
Beyond that, what an officer chooses to include among their personal belongings is up to them.  It's up to them to weigh the risks of bringing any particular valuable item onboard.