Why can someone be arrested for trying to commit suicide?

I know that from a religious point of view it is wrong to even think about taking your own life but don't even have the so called "freedom" to decide what to do about oneself!! that, in my personal point of view, is totally wrong!! Just like when you get a traffic ticket for not wearing a seatbelt!! I think it should be MY choice whether to wear it or not!! who's the one getting killed, me or someone else? "The Land of the Free" I just don't think so!