Most Equestrians have a nice life. They wake up each morning to a beautiful sunrise, they go to a job that perfectly fits their interests, and they retire each night to a peaceful sleep. Do any of them ever wonder why their lives are so nice?
As far as Soot Streak is concerned, most ponies are better of not knowing.
After a colorful incident from his past, Soot was conscripted into Princess Luna's personal supernatural hit squad. Now, he serves Equestria from behind a veil, keeping ponies safe from all the troubles they never think about. For Soot, life is simply a question of what will kill him first; the monsters he fights without, his own comrades, or the monsters he fights within.