That means you believe you simply die and your pain is alleviated, which many people (who are not intellectually lazy) don't agree with, so they might want to genuinely help out. In any case suicide most often comes from a moment of spiked anxiety or panic, so why should we just let people who would otherwise care and like to be near us take their lives in a moment their rational brain isn't working with the calm generally afforded for important decisions (say, business decisions) that have big effects the person contemplating death otherwise cares about?