Because under the Accords Jessica would hardly gotten away with all what she did. Ans also the response to a superpowered threat would have been a bit bigger than just the local cops.
I don't think we really know enough about Sokovia Accords to make statements like that. You seem to be assuming that the Accords are identical to the Superhuman Registration Act from the comics, but they don't seem to be nearly that sweeping. It affects the Avengers, and on Agents of SHIELD Talbot dresses down Coulson for having "unregistered assets" but in both cases, we're talking about superhumans engaged in matters of international security. Superhumans who ignore international boundaries and operate beyond the reach of domestic police forces.
Superhumans who do not operate at the international level would not be affected by the Sokovia Accords. They'd be a domestic issue, handled under domestic laws. Since Jessica operates entirely within New York, the Sokovia Accords almost certainly don't apply to her. If they did, they would have to apply everywhere in the world, all at once. That would require a massive international organization, far beyond the capabilities of the United Nations. It would require an organization like SHIELD, but SHIELD is gone (at least SHIELD as it once was, Coulson has repeatedly noted that they no longer have the resources they once had).
I have finished all of Season 2 of Jessica Jones, and I liked it quite a bit. Like the first season, the second season had clear themes and I feel did a better job of exploring them through the subplots of each of the characters. It is a slow burn, but I think that fits the character and mood the show is trying to create, and the themes it is exploring -- I don't think you can tell a story about trauma and addiction and also have break-neck pacing. I think it would be too dark, too mellodramtic. These kind of heavy themes need time to gestate.
Despite the slow, intentional pacing, none of the episodes felt like padding to make up for a thin story (a major flaw of Season 1). Season 2 also benefited from not having any characters as annoying or nonsensical as Ophelia (the insane twin from upstairs).
What I really think makes Season 2 fascinating is its lack of any clear villain, which I think is both very appropriate for a show about a woman who isn't clearly a hero, and also a very smart move given how powerful the villain of Season 1 was. Topping Tennant's Kilgrave would have been a nearly impossible task, and Season 2 cleverly avoided that issue by giving us two "villains" who are extremely sympathetic and lack malicious intent. Alisa Jones isn't evil, she's suffering from brain damage and can't control her actions. Karl Malus isn't evil, he genuinely is trying to save lives and keep things from spinning out of control. In the end, the story becomes about Jessica trying and failing to save her mother from herself, but coming to question her own purpose.
By subverting the traditional This Season's Big Bad story structure that has become the defining trait of superhero TV ever since Buffy The Vampire Slayer, Season 2 managed to tell a new and different kind of superhero story that was quite refreshing.
And now, nerd stuff:
- I was disappointed by the death of Will "Nuke" Simpson. After Charlie Cox revealed that Daredevil S3 would be based on the Born Again storyline, I had hoped that they might use there in some way as a reference to Nuke's appearance in that comic.
- While Trish's storyline is very different than her comic storyline, I really like that they've been building her up as a wanna-be superhero and have now given her superpowers. I'm really looking forward to an appearance by Hellcat in season 3 (and don't think I didn't catch that she scratched the face of that gay-basher who attacked Malcolm, nice little call out).
- The Whizzer. Oh lord, I never thought in a million years I'd see any version of The Whizzer in the MCU, and this version was perfect. Sometimes the MCU, and especially the TV show, wastes good characters on throwaway parts and it annoys me, but it's not like they were ever going to use The Whizzer in a serious way, not with that name.