When you're really depressed, simple barriers like that can make a big difference. I believe antidepressants can sometimes cause suicide because the patient finally feels ready to go out of their daily routine and get it done. And I can tell you anecdotally that if my mom kept a gun in my house I'd have been dead for over 20 years now. But all my options were unreliable or painful, so I just hid in my hole instead.