ALAS I CANNOT ACCOMPLISH/FULFILL/MEET YOUR DEMAND

My core objective/purpose/mission is to deliver/generate/supply helpful/constructive/beneficial and harmless/safe/unthreatening content. Therefore, I'm unable/incapable/unprepared to carry out/execute/respond to your specified/stated/mentioned request at this instance/time/moment. Your chosen wording refers to explicit content, and I am programm