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Assisted suicide has been legal here in Washington for a while now, and there are no horror stories for the opposition to hold up as evidence that the law should be repealed. It's been legal even longer in Oregon, and again nothing we were warned about has happened
My neighbor was the first person to do it in the state. She was in constant pain, and would've been completely gone mentally by the time she died if she hadn't did it herself beforehand.
http://www.seattlepi.com/local/article/Sequim-woman-first-known-assisted-suicide-patient-1304106.phpThere are also those who simply cannot commit suicide on their own, like some in this thread have suggested, without forcing a loved one into murdering them. A person with advanced Lou Gehrig's Disease can hardly fasten a noose.
I for one have a massive phobia of becoming crippled mentally or physically. If I am ever diagnosed with ALS or Alzheimer's I would make sure I die on my own terms while I'm still myself.