Harry generally feels empathy, but not in Winter Mantle sociopath mode.
No, but an Ak-47 doesn't feel empathy either, nor is it a sociopath, it is a weapon of great power. The mantle doesn't think, it has no emotions, it cannot be a sociopath, it is a huge bundle of adrenaline. The problem is many of the guys that have held it were sociopaths with weak wills, like Slate. Harry is neither and learning to control it and remain him has been difficult. Harry lost it when Rudolph kill Murphy, the mantle had nothing to do with that, that was pure emotion.. But it wasn't in any way the act of a sociopath, a sociopath by definition is;
noun: sociopath; plural noun: sociopaths
a person with a personality disorder manifesting itself in extreme antisocial attitudes and behavior and a lack of conscience.
The one thing Harry doesn't lack is conscience, once he came back to himself he felt remorse.
Yes, it was his imagination what he thought he smelled because he had almost did an evil deed, but he didn't, he was stopped. Do you think the odor of sulfur and brimstone was coming off of Michael's sweat when he was trying to beat Father Douglas to death with a baseball bat? He was doing an evil deed, but Harry stopped him before it was done.