Sure, but let's not forget the time/times that you didn't.
There are no such occasions.
What decisions did we make about Leliana's character in DA 2?
None. That's why I said 2 games - DAI and DA:O.
In fact, just how is it that we're introduced to her again? Isn't she "bathing her blades in blood" in the name of the Divine? Did you miss that cutscene?
She attacked some blood mages who were actively trying to kill people. Hardly the same.
So let's look at her character development: She's a Bard/Assassin for Marjolaine, she can be hardened in DA O to embrace that, in DA 2, we see that she has indeed embraced that, and now, all of a sudden, she should be that scared girl we find in the Chantry in DA O, instead of what she has been turned into by Marjolaine prior to her betrayal, potentially the Warden and then Justinia?
She should be a mature, competent, spymaster who uses violence when necessary, and listens to her compassion when possible as both her long-time lover and her superior have encouraged her to. Or, if the player chose differently she should be a ruthless spymaster who uses violence when it's
useful.
She shouldn't be a dull brute who murders people because she's in a bad mood and then rants deludedly when someone objects.
(Note that paragon Leliana who reforms the Chantry through hugs is also stupid. Particularly since the Inquisitor could have sent her to murder inconvenient grand clerics and tear out tongues before this)
So in context with her actual story, the choice makes perfect sense. I know, they tied it all together, put a nice little bow on it, but people went "mwahahahaha, I get to let her kill someone" and then freak out because she kills someone?
People "freak out" because they spent 2 games persuading her to be compassionate and then she suddenly turns into an insane murderer. And then you can't even do anything about it.