I agree, and for the sake of clarity I would like to make my standpoint clear on this and expand on why I placed 'victims' in quotation marks earlier.
Compared to Harley Quinn, Babs and Jason were much more like innocent bystanders when they crossed deadly paths with the Joker, even in the situations of how their trauma took place, Babs being in the safety of her own home and Jason trying to find and reassure his mother. Harley's story is that she was more or less seduced by the Joker and manipulated further once she was blinded by her love, but yes, she very much knew him to be a murderous crazed criminal and still chose to side with him, all whilst adopting a new criminal persona for herself as well.
Whilst I completely agree with you on this topic of Harley not being nearly in the same category as Babs and Jason, this idea of Harley as being 'just a victim', is in all fairness, whether we like it or not, kind of how she is seen now a days and it's perpetuated by DC. It's why she is placed in stories like 'Heroes in Crisis', and within that book when she is crossing paths with Babs, she isn't treated with any sort of wariness or distance, instead she gets a hug.
I apologize ahead for this tangent but...
Harley's antics in her main books, seem to be carefully ensured that no matter how violent or reprehensible they are, they are presented so cartoonishly loony and therefore too unimpactful, to show her as anything other than a 'fun loving clown gal'. And that's totally fine by itself, but then the abuse narrative shows up and becomes the only thing that's presented as carrying any sort of weight and therefore ensures that she is only seen as a victim of Joker, whilst her own crimes with or without him are swept under the rug by the guise of being just a 'ca-razy girl power' anthem.
I love her growth as an independent character, but I think often times the idea of her as the face of abuse victims has created such a black and white view over her origin, one that leaves little room for any nuance to her as a character and not a symbol, lest she be seen as unsympathetic. She was an intelligent woman who found her escapism fantasy in a love for a murderous monster, and who was completely fine with hurting and killing others with reckless abandon alongside her lover, but then as soon as, said lover, hurts her instead, she becomes 'just a victim', and often that ends up overshadowing her character, despite the obvious context by which it all occurs.
Side note: I been loving 'Harleen' by Stjepan Sejic though, the tone is much more thoughtful there and considering it's structured from the more automatically sympathetic position of being in Harleys mind and her POV, it still feels much more self aware and critical. I'm curious to see how that story finalizes her origin.