People argue all sorts of dumb bullshit - it doesn’t make them right.
They do, and that doesn’t mean they shouldn’t be punished, what it does mean is you can look at their reasons when determining whether or not they are likely to re-offend. The person who only kills people who rape their kid is not likely to do it again vs. the person who’s threshold for rape is that they don’t respect other people’s body autonomy when they’re horny.