To be even more reductionalist--if we have empathy the understanding that hurting others is bad is built in (that is pretty much the defintion of empathy). What is evil other than the indifference to, or enjoying of, hurting others?
"This is going to hurt me a lot more than it's going to hurt you..."
Sometimes people will understand that what they're doing is hurtful and truly regret that, but will be attempting to save someone further hurt down the road, or believe that they're actions are for the person's "own good", or that it's regrettably necessary tough love.
I recently read an article where a woman, concerned for her adult, capable, sane sister, and wanting her sister to come live with her (which the sister refused) went to her sister's house, bound and gagged her, and took her by force...all for "her own good". I think I know why the sister didn't want to live with her!
(I read about this in a print article called "News of the Weird" that appears in "The Funny Times". My in-laws have a subscription. Sorry no link.)
So good motives doesn't convince me that an act is good, and actually caring about what harm you're doing to the person doesn't convince me either, if it doesn't stop you from an evil act.
On the other hand, maybe it would be more accurate (and maybe it's what you intended in the OP) to consider someone's suffering less important than another goal to be indifference. I still wonder, though, what if the goal is to prevent them from
more suffering?
I guess that brings me back to my "situational" stance.
Sense someone else brought up a Star Trek episode I will to, is it evil to stand by and watch someone suffer and die for the good of many. In the episode "The City on the Edge of Forever" Kirk stands back and watches his true love Edith Keeler die to keep Hitler from winning World war two.
This is just the sort of thing I was talking about. Surely, the Kirk character love Edith and wasn't indifferent to her suffering, but he was trying to prevent more suffering, so many people will consider his choice to let Edith die Good, maybe even heroic.
But it also brings up a completely different argument: "The ends justifies the means."
Does it, really?