If you were in any way familiar with the story, you would have read about a vicious criminal who stabbed a young woman 22 times for what he acknowledges was no particular reason.

If you were in any way familiar with drug abuse research, you would know that although meth is incredibly destructive, its use doesn't actually correlate meaningfully with increased propensity for violence. The only common drug that does is alcohol, and of course the DA, like the rest of society, is doing squat about alcohol abuse.