I'll preface this by saying that although I ship them, I don't have A Plot for them yet, the way I do for other of my jason rareships, and thus I have yet to ~envision how I'd personally have it go down. but these are my thoughts on them at the moment.
first of all... the green arrow arc isn't this HORRIBLE, TEERRIBLE, AWFUL thing that happened to mia, or this irredeemable evil jason did, and I'm always baffled whenever I see it talked about that way. like. mia is not a normie kid living her normie life in a slice-of-life teen story. she's a freaking SUPERHERO that risks her freaking LIFE on the regular. jason is this dude one, maybe two years older than her that didn't even want to seriously harm her.
she obviously wouldn't walk out of that encounter with kind thoughts about him. he was an asshole! he wanted to scare her! (and he had a GOAL re: sidekicks and the danger they're exposed to and a point to prove about it, which I always feel is handwaved). but like, jason is not a static character, or not doomed to be at least. he'd have to sincerely apologise, saying that yeah, he was a shit, that was a shitty thing to do, he was projecting some stuff on hers and ollie's relationship that wasn't even true and he's ready to compensate her for it. and again, these are... not normal people. like sorry but I just don't think what jason did in that arc garrants an eternity of hate and enmity to them.
and obviously not hating him forever/seeing his actions for what they were and not more/being able to forgive them in the face of a sincere apology and amendments isn't the same as actually seeing jason as a romantic prospect! but it's a first step into a less than hostile dynamic.
and within that context, I could see mia thinking back on some of the things jason said in their confrontation, about them being alike (also, winick wasn't been subtle in his parallels here, but I've seen people being VERY obtuse about this part of the scene aΓ±sldkf). I haven't read mia in a team context/with lots of peers her age yet, but even if she's more likely to find people with commonalities/messed up childhoods among child heroes, common ground is still something to be curious about, to bond over. and such very specific common ground would be something I think she'd value.
I haven't reached that arc yet, but I know mia has also killed, once, in circumstances where she thought she had no other choice. and she doesn't want to do that anymore, she wants to be a hero and stay on the path and raise above. those are things that I find interesting in conjunction to a dynamic with jason, in particular. the way it would lead both to conflict and to a different level of understanding.
also, there's always this sense in posts against these ships where I feel like... mia doesn't have to be perfect. she can be messy and make questionable romantic choices and maybe they pan out or maybe they don't, but it could be something actually fun to explore with her character, to see her in a context like that. less in the "bad boy attraction" sense because really, past aesthetics jason does not fit that role in a romantic sense, but as in getting to explore other sides of her character through a romantic relationship, especially as a character with both a history of sexual abuse and with HIV. and I'm sure there are other candidates for that, both canon and fanon, but it just happens that the first thing I read with her was the Jason Being A Menace arc and that I looooove a meet ugly, especially if it comes with a "recognition through the other (derogatory)" bonus.
anyway. I'm not trying to convince anyone because I'm perfectly happy in my rowboat-sized ships and it's nothing to me if other people disagree or judge me for them lol, but thanks for the chance to talk about them a bit!