Legalising suicide means something different than what you seem to be implying. Legalising suicide means that we don't throw people like your friend into a prison.

Probably you are just using it as a shorthand for "legalising assisted suicide. I assume you live in a modern western country where the idea of punishing someone for trying to end their live is unthinkable. Sadly there are still countries where they would have punished your friend. Because of this it's better to be aware of the distinction between the terms.