I don't know why either one can only speculate could it be both parents are working and struggling their butts off to keep afloat not having the time to spend with their kids,problems in school,drugs,the hard cold fact you are becoming an adult and have to fend for yourself in the real world.I have always encouraged my kids to talk to me about anything with no punishment unless it was well deserved I have always listened given my point of view tried to steer them from wrong,I don't think you can stop it, your mind is very powerful in a positive and negitive way. I am finding this out myself and without going to deep I've been struggling with depression for some time now and its damn hard to fight it off nothing seems to matter everyday is a struggle to get through, I've lost interest in all that I had a passion to do before. I try my butt off everyday to get out of this hole so I think the only way to avoid suicide is to face it dead on and see who wins you or your brain.