I think one think is loving iin the sense of giving forgiveness, praying for that person, etc., which is the way the pope John Paul loved the guy who shot him, and something very different is being in love and wanting to marry a person who is a dangerous criminal. Maybe in an of itself is not a sin but there are some serious repercusions when we are talking about marrying someone who doesn’t have any respect for human life or any kind of moral. If we are talking about a situation of someone who commited a grave sin and is sincerely repented and is working his/her way back to God, yes everybody deserves to have an opportunity. The problem arises when we are talking about someone who doesn’t have any moral or respect towards others and to whom the criminal life is a lifestyle. Unfortunately, when it comes to most criminals (especially people who commited violent crimes and the ones in jail), crime is more of a lifestyle, they are not repentant and jail only makes them worse. I think marrying a criminal is a very risky situation, and remember when the Roman Guard slapped Jesus on the face, what did Jesus do? He didn’t tell him slap me again; he told the Guard “Why did you slap me?” That means yes we must love our enemies but you can’t allow injustice.