We onow exactly what such a world looks like, the approach the "author" advocates for was already tried multiple times. In fact, it is currently being tried in multiple places. Ans besides causing suffering upon suffering, it doesn't do anything.
If that's what consequentionalists believe, they are very far down the rabbit hole that accepts destroying lives and killing people for some greater goal. A very dangerous way of thinking indeed...
The author's article essentially builds a strawman, calls that consequentialist logic, and proceeds to happily burn that strawman to sell an alternative horror. Also there's a Godwin point because why not.
You'll find no significant evidence of consequentialists advocating for family punishment ; even if the author's claim that it's effective was supported by more than his word.
Consequentialism refers to a set of theories that optimize some metric in the long run, and everything is judged against that end. You still have to specify the metric. Contrast that with bottom up theories, where good actions are composed of things that are categorically good.
If the measure is defined as low crime, or progress towards some ideological goal, then I think the argument has some weight.
But descriptively, people are individual consequentialists. They care about the consequences to their part of the world. How am I doing, how is my family doing, how are my friends doing? If the article's policy for justice makes any of those things worse, then an individual consequentialist isn't in favor of it.
The author is explicitly not trying to sell family punishment. They are merely pointing out that it can be very effective. Making evildoers themselves suffer maximally for the crimes they commit is just another extreme.
Both, family punishment and excessive suffering as a form of punishment, are simple cruelty. Neither do the prevent crime, nor are they effective, history has shown us that.
Seems to be yet another example of totalitarian and proto-fascist ideology taking hold.
If that's what consequentionalists believe, they are very far down the rabbit hole that accepts destroying lives and killing people for some greater goal. A very dangerous way of thinking indeed...