people will still mourn your life even if you ruin it. If you ruin your life, people can mourn you even when you're living, it's not hard to break down at the thought of a loved one sabotaging their life. When you kill yourself it would just make it worse in that respect. If you ruined your own life, your family would be distraught seeing that, even if they only express hatred/resentment toward you, they would be distraught in a similar way to your suicide. Then when you do commit suicide, they'll feel all the same emotions they would if you hadn't ruined your life, they wouldn't be thinking "oh well, they wasted their life anyway", if they love you.