I'm curious, why exactly do you think Near let Misa go at the end of Death Note instead of imprisoning her? I mean I do think it was generally right to do, since she didn't really kill anyone when Kira wasn't in power, but I wonder why Near didn't press any charges.
I personally think letting Misa go was the wrong choice entirely, both for the sake of Misa’s crimes alone as well as because it’s deeply hypocritical when compared to Mikami’s punishment.
There is literally no way to argue Misa was forced into committing her murders as she starts killing way before she ever meets Light and he gets the choice to tell her a single thing. It was Misa’s choice to murder innocent policemen, it was Misa’s choice to hold the world hostage with her ultimatum on TV. These are heavy crimes that she committed entirely out of her own volition.
And if you argue that her amnesia about it as well as lack of a means to repeat any of the crimes is grounds to let her go, then Mikami shouldn’t have been imprisoned either as both of these conditions apply to him as well.
Letting Misa go is absolutely arbitrary when put into this light.
But something L and Near have very much in common is their extreme focus on original Kira as the main culprit of the Kira case. Both primarily view the other Kiras as a means to get to the first Kira rather than criminal cases on their own.
In that sense, Misa just isn’t important enough anymore? Near has reached his objective, the Kira case is over, everything else is bureaucracy around proper procedure. I do see the reasoning that in practice Misa is not going to cause this kind of trouble ever again, which Near seems to prioritize over all else.
And this is another point where the “Near killed Mikami to ensure the warehouse meeting goes smoothly” theory kind of saves the day for me. Without it, the hypocrisy of only imprisoning Mikami solely because he just happened to be physically present would drive me up the wall. With it, it makes sense that Near imprisons him as he needs this in order to cover up for the fact that he caused Mikami’s upcoming death. It’s not fair on a theoretical level, but at least it gives Near a good reason to treat Mikami and Misa differently in this regard.