There are two aspects (ha ha) of the Laws of Magic here. There are the offenses that will get you beheaded if discovered by the White Council, and the acts which will stain your soul and get you Lawbreaker Stunts.
If the conceit of the game is that these black ops warlocks are well and truly beyond the White Council's notice somehow, then the beheading element is (for the moment) moot.
As for the soul-staining Lawbreaker element, this depends on what kind of game you want to play. The DresdenVerse establishes that warlocks - who are almost invariably ignorant of the White Council until they are breaking down the door - are corrupted by using magic in particular ways, *whether or not* the White Council is there to point a finger and say "bad warlock!" Butcher has set it up as a fairly immutable consequence of mortal spellcasting, a "natural" effect of doing these things.
So if you want to play a canon-compliant DresdenVerse game, then yes, these acts are going to warp and twist these black ops wizards in the ways that the RAW have set up, in line with the rules of the DresdenVerse as it has been more or less established.
The government may or may not be savvy enough to deploy these wizards in such a way as to slow this descent, or know what to do with them when they turn bad. The government may even have an agreement with another supernatural group to provide them with the equivalent of
Ebenezar McCoy's Blackstaff
(I am also reminded of an anime series I saw recently, called in English "Puella Magi: Madoka Magica"
in which "magical girls" fight evil until they, themselves give into the futility of their new lives, turn evil, and become the very things they were originally fighting
.
But, if you want to play a Dresden-flavored black-ops game in which this doesn't matter - because they are going to "Special Ops Heaven," then set those rules aside. "Special ops Heaven," of course, from this bit in the Venture Brothers episode "¡Viva los Muertos!":
Hunter: What is all this namby-pamby feel-bad-about-good-wetwork
?! You're beyond good and evil, Superman! You work for the government.
Brock: What about uhhh, humanity and empathy and all that garbage?
Hunter: Who cares? You're going to special ops heaven.
Brock: Really?
Hunter: Really! And it's god-damned great! The G-Man Valhalla! There's trim and guns everywhere. And we eat steak flavored clouds and poop secrets!
Brock: But you're not even dead. You're a woman!
Hunter: And you're a tool, boy, a tool! Built for a single purpose by the United States of shut your third god-damned eye for a good
reason! You can't teach a hammer to love nails, son. That dog don't hunt!