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Some people are not physically capable of suicide. Some people are technically physical capable but under constant medical care that means they would effectively need collusion from others. Some people believe they shouldn't have to die alone and want the choice to have their family or others around them without leaving their family exposed to criminal charges. Some people simply believe they should have access to reliable, comfortable and painless deaths with the assistance of a professional.

Most people who attempt suicide fail. Some of this is due to sheer chance (surviving a jump from the Golden Gate Bridge), some of it is failure to understand the means they choose, some of it is due to sheer psychological inability, like people who faint at the sight of blood.

Are you less baffled now?