Snow says to disguised Regina that in her mind the Queen was in too much pain and looking for someone to blame. The she sees the bodies and changes her mind. Yet we know she changes her mind back again at the scene in the Cricket Game flashback, where Regina was about to be executed.
So now I wonder this–what made her change her mind back? What good did she see in Regina after the village slaughter?
Remember, by that point Snow is no longer a stranger to the idea of wanting revenge. After taking the potion she procured from Rumplestiltskin, she felt the desire to kill Regina. It’s possible that after experiencing that she realized what it’s like to be enshrouded in anger and darkness, but that it is possible to come back from that place.
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"Nothing is easier than to denounce the evildoer; nothing is more difficult than to understand him."