Absolutely not. Nowhere did I say if we can't catch "everyone" then catch no one. I literally gave an example of catching 85% as good policy. 50% is more than fine too, and even much lower depending on the situation.

In fact, it's the very opposite -- I said if we're already catching almost nobody (think 1%) then incentives have been set up in a deeply unfair way.

I added an "edit" to my comment that hopefully explains further. The point is to deter broadly. If that's not happening, then policy is total failure already. Because the point is deterrence, not individual cruelty.