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.
If I have a heart attack, does "having a heart attack" need to be criminalized for a police officer to render aid? The notion of criminalizing suicide attempts to protect a person is fundamentally absurd.
Here you go: https://theappeal.org/suicide-attempt-gun-charges-incarcerat...
That said, that man was not prosecuted for attempted suicide. He was convicted for possession of a firearm without a license, and acquitted for stealing his fiance's gun.