Do you want to know something funny? Even after everything you've done, I would have saved you.
~ Batman's last words to the Joker.

There are heroes who are very merciful to others and are reluctant to kill, including villains that have wronged them in the past. This understandably can backfire on them at time, as they refuse to accept that there is no other option to kill sometimes, though some are willing to resort to killing when absolutely necessary.

It is also opposite to merciless.

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