From what I know, many suicide attempts are made by people seeking to end their pain, the thought of others is far, far from their minds. A woman I know eyed a certain set of rocks every day for months on her daily commute, figuring that would be a sure way to die, hitting them at 70 miles an hour. Afterwards, recovered from her depression, she acknowledged that it was good she never followed through with it, as that's a particularly bad section of highway for commuters anyway, and other people would have probably been injured when rubbernecking, never mind anyone hit by debris from her crash.