1. The police and courts are independent, not on the left or right
2. Freedom of speech allows you to say anything you want as long as it's clearly not going to cause violence, threats, harm etc
3. The couple went round harassing rape victims in order to get evidence to spin and sell a story
I'm sceptical, them being imprisoned could only make things worse and more divided politically with more militancy, but if there's the legal grounds for arrest then it's the right thing.