D.i.s. (death intelligence service)

This coalition of the mad offscourings
Possessed by killin' clansman's minds
Each day with insane blaze in eyes
It hunts for men of other kind

They call their war, unleashed themselves
The "holy", "sacred" and the "blessed"
But no-one of them can tell
The real reason of this bloody mass

Don't want to live among the liars
Where not for one day men felt the safety
Obtain the justice, shout the fairness
Don't let the mankind in foul depravity

Their eyes forever blind with wrath
Their hands are stained with guiltless blood
They called their union "D.I.S."
Please tell me why they're still alive?