I am going to say it.

It comes to a willpower and individual strenght. Or at least to self-preservation. How we manage the bad times. If you give in and let your entire life collapse, it is hard to rebuild back. When one tries to hold together or preserve at least the most crucial aspect the recovery is easier. Going totally crazy is easy (read Coelho or Susanna Kaysen... they been there, done that)... but it is hard to recover from. It is hard to re-learn how to live.

Yeah, support system is important in the bad phase. Sometimes one has to reach out and ask others to help them get through it... but they cannot walk through the fire for you. You have to do it, still. And the "support system" can be counterproductive if they enable you in the bad ways, in not-living. It "no, you really can't, can't you see how broken you are?".

Taking break from life is easy and tempting... but often there is price to pay.