Trash or Created in His image?

I have a friend from college that posted on facebook something about a recent trial in our area. The woman was convicted of killing her newborn. He said something to the effect of "this trash deserves the death penalty."
I have a heart for justice; don't get me wrong. I think it is a basic instinct and God-given (since we are created in His image) instinct to see consequences to misdeeds--our own or other's.
I didn't engage with this friend, since facebook isn't always the forum to start a war of words. Instead, I'll spend a minute here working out my thoughts in the relative privacy of my blog.  :)
I was convicted a few years ago about calling people "White Trash." And as much as I want to describe folks like this to you for the potential humor value, I'm not even allowed to do that. Because it's demeaning and I think horrifies God when we call His children "trash."
I still believe that it is God's heart to redeem humanity. The good, the bad and even the horrifying ones. I think he showed us His great grace and mercy when He forgave the thief on the cross and gave Him an assurance of joining Him in paradise.
As Christians, we have placed ourselves in His seat as judges of human trespasses. Can I understand why someone would kill a sweet, innocent baby? NO. Never. It hurts my heart, as I really literally would have taken the baby to raise. I do know that the enemy our souls is always at work, and the residue of a sinful world can be hard to escape. I don't know what kind of world this mom grew up in. She might have been so broken and scarred that she had nothing to draw from in the way of God's goodness. She deserves a punishment in the natural world, to be sure; but I would love to see her healed and whole.
We are called to love all people and see them as God sees them. I don't have any forgiveness passes to give out. All I can do is point to the cross. It changed the course of history. It changed my life. It can change ANY life. Jesus died for ALL sins. I simply can't believe that we can call anyone "trash" and carry the cross at the same time. We all deserve to be tossed into a pile to be crushed and burned. But Jesus said "NO. I will side with them. They are not trash."