I can’t actually think of any place were Leia comes off as particularly compassionate, especially when it comes to the Empire, which is not really surprising as she was raised by Bail Organa, having her home blown up by a Moff just as a demonstration and to spite her, after getting tortured by the Empire certainly would not help her in caring for the Empire. Though there are several examples where she is easily willing to forgive Imperials that abandon the Empire to join the Rebellion. Also Stormtroopers are notoriously loyal to the Emperor, way more so than other of his minions, so it could easily see that there is a lot less hope of them ever getting “redeemed”. Oh ANH certainly has it, Obi-Wan just casually hacks of someone’s arm even though he could as easily have gone for the Blaster and he is meant to be an enlightened teacher and the last member of an order of honorable, holy knights. Also check out the wounds caused by Blasters in original ANH version, you can see burning gaping holes in several of the Imperials. Even Dennings Luke is surprisingly tolerant and forgiving in many places, adapting a certain grim determination only when he has to.