I empathize with Eliza's initial post:   when she heard that "as a Christian, one should forgive absolutely anyone, no matter what they've done".   

I don't like blackmail of any kind.

I also really value forgiveness.   But carrying resentments could have their value too......if that's what we choose to do. It helps to reinforce our own values.    If our resentment is harming our own mental or physical health.........then I think forgiveness is a great option.

If we want to do some 'work' with the perpetrator to assist them to take responsibility first........great.    If we decide that doing that is giving the perpetrator too much 'power' over us....so we'll forgive unconditionally!   Just as great.

As for "Matthew 6:14-15
"For if you forgive men when they sin against you, your heavenly Father will also forgive you. But if you do not forgive men their sins, your Father will not forgive your sins."?   I say what a terrible reason for choosing forgiveness.