This assumes lighter sentencing achieves the desired effect of sentencing. I suspect we could not even agree on the desired effect of sentencing, much less whether lighter sentencing achieves it.

It also assumes the situation won't be recursive. Lighten sentences for men.. then suddenly women get even lighter sentences. Repeat until there is no sentence at all?

The article basically boils down to, "It's not fair to men. We should Do Something![TM]" It does not strike me as a well thought out appeal to the reader.