Good point. If I was a purist I'd say "no". Using those weapons might be. Not being a purist I'm happy to make exceptions for probable use or effect of the ac

Good point. If I was a purist I'd say "no". Using those weapons might be. Not being a purist I'm happy to make exceptions for probable use or effect of the activity. So: Selling weapons to people likely to commit crimes is a reasonable exception to the simple version above. and Prostitution, where the probable outcome is a mutually satisfying service involving ONLY the parties involved is not a reasonable exception.