Don't agree with this, Chantry Lels was running away, hiding from her problems, she was pretty much stuck in a dull dreary rut and when she saw the Warden at Lothering she jumped at the chance to get some adventure back in her life. All under the guise of some vision she said she had. She owed a deep debt of gratitude to Divine Justinia of course and I'm sure she achieved some comfort through her new found faith but underneath she still craved for the excitement of her past life, hell she even admits it during the talk after killing Marjolaine. Lels is no push-over hardened, if anything she is her truer self.
Again, that's your opinion. Leliana, to me, didn't want to become what Marjolaine had become. The self-destructive life of a spying Bard may be fun, but it's short-lived, and you end it miserable, alone, and paranoid, as Leliana saw with Marjolaine. For a long time Marjolaine was really the only love and only guidance Leliana had, before she fled to the Chantry. With Chantry principles being her guide and the Warden being her love (or just an adventuring companion), she had a chance to change and to break away from her old life. Yeah, the adventure and thrill of it excited her, but there was no reason she couldn't hold on to her old values and have that fun. I didn't think Leliana lied about her vision or lied to get on the Warden's team. I think she genuinely believed what she said and believed in herself, until Marjolaine's cruel worlds changed her perceptions. Marjolaine was a deceiving b*tch, and I didn't want Leliana to become the same way. Leliana felt happy in killing Marjolaine, but of course anyone would in that situation. I didn't think it was the means of ruining an entire new lifestyle just to go back to something Leliana didn't seem to want to go back to. And yeah, Hardened Leliana was worse for relationships, I thought. She seemed pretty happy with getting it on with a prostitute, then probably discussing sex tips afterward. I prefer a bit more monogamy than that.