The earnest answer is that it's more predictable than random violence, and its predictability makes it somewhat more preventable.

That said, there is a tendency for a system to drift away from this predictability as it's subjected to "review" by people who really, really want a particular outcome, regardless of the systemically-proscribed conclusion. "Bespoke" judgments for edge cases undermines the principle of predictability, which makes a return to "random" "coercion" desirable for some (as those who coerce in anarchy generally have less absolute power than a large system does).

But then, how do you show mercy (people are driven to do so) in a zero-tolerance environment?

This is the tension.