They hire people deemed too unstable even to become cops.

And in dire financial need - significant sign-on bonus, shitty pay. (Shitty job)

Many more aspects, all kinda included in my first sentence.

(She) believes the tragedy could have been avoided entirely if the federal officials tasked with vetting new hires had simply contacted her before issuing the 37-year-old rookie a badge and a gun.

Or simply having sane background checks. But that way they'd never be able to fill the ranks of people "willing to do what it takes" (i.e. devoid of morals and ethics).

Still, I appreciate every (ex-)wive or (ex-)girlfriend coming forward.

A violent dipshit being drawn to a violent, dipshit filled, state enforced militia? Colour me surprised.

Yes, this was clearly the goal. That's kind of what fascists do

Prevention was never their goal.

It's by design to not prevent it, it's encouraged, as evidenced by the FBI telling ice they will no longer investigate their crimes.

Gross negligence in the hiring process.