It's my understanding that this is a crime that is never charged or prosecuted. Rather, if (attempted) suicide is a crime, it serves as a legal fiction that provides a structure for first responders to intervene. Police can then enter an office where someone is hanging out a window without a warrant, for example, because there are exigent circumstances (a crime in progress). Officers could also physical restrain someone trying to jump from a bridge and have a more straightforward justification for this after the fact. I think this is a societal good.
Have you seen any examples of suicidal people being charged or prosecuted for attempted suicide? I can imagine that this could have opportunities for abuse, but not ones that are qualitatively different from probable cause writ large.