Good and bad exist always, everywhere
Real secrets mean more than hiding that card game from you daddy. Real secrets can be hurtful. Make people do bad things.
Bad things can happen, and often do--but they only take up a few pages of your story; and anyone can survive a few pages.
Things never go wrong at the moment you expect them to. When you're completely relaxed, oblivious to any potential dangers, that's when bad things happen.