I don't think this is quite an appropriate blanket statement: What if the space station or vehicle is sealed with super-indestructible force fields? Would a mere projectile such as a thrown dagger or bullet be able to penetrate a craft that is built with a reinforced alloy several meters thick?
Some sci-fi settings have weaponry that only reacts with biological targets. I know of one that shoots an invisible ray that causes perfectly normal folks to explode from the inside after a short 5-second delay. Completely harmless on metal, though. Honestly, if you're creating the setting you can do any #### thing you want. There is no reality here.
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