Two Amish men rape their sister. What? Was she churning butter too suggestively? Did she show a little too much ankle in her ugly utilitarian dress?  

They deserve to be eaten alive. You do the crime, you stop hiding behind your religion and do your time. It would be the better alternative for what is likely to happen to them next. Now their sister will probably be unable to marry in the community. They will probably be shunned and will lose all connection to everyone they know.  And if they decide to start raping other women, that's the judge's fault.