Well i live in America and here are the facts:
1. If you fail to commit suicide then they will arrest you for taking a life.
2. My teacher has told me why it is illegal and why they arrest you and I am pretty sure thats the official reason. It isbecause you are taking someone's life ( like on 1st reason/ fact ) even if it is yours you are still taking it so it counts s murder or atleast trying to if you fail
No offense but i don't understand how you can fail suicide i am not trying to be funny or anything but it is pretty hard to fail suicide whn you commit it, but thats why its illegal.