Maybe..the thought of someone I love having to go to prison (especially if it's a really long time), or at least the thought of having to be without them, could be enough to make me take the risk.. it also depends on how likely they are to lose anyway.

I disagree with Pandy's opinion that "justice can't be selfish." What's done in a courtroom isn't necessarily justice. It's often retribution, and revenge has nothing to do with justice. Even when it's not retribution, there's no reason to assume the amount of penalty for a crime happens to be the exact amount that's appropriate, or even that they really necessarily did wrong by doing something illegal.