I'm a bit on the fence about this, BK pleading guilty to murdering Kaylee, Ethan, Maddie, and Xana and sending statements to their families (???) less than 2 months before his trial.
But I also think it makes sense in terms of him / his defense team pulling out all the stops to try to build a case that he was innocent over the last few years to avoid a conviction, and now reading the writing on the wall that his goose is cooked, so close to trial, that they told him and he has accepted it's a No-Go.
And perhaps his family (as well as his defense team) has been imploring him to plead guilty since his guilt is so obvious (IMO) so he wouldn't be subject to the DP if convicted at trial.
Still, IMO, he has effected the maximum amount of carnage he could and devastation of the victims lives, their families, community, state, and society at large up until he tucked tail and ran, waiting until the 11th hour to pull the plug, and ruining some of the victims' family members hopes for justice (assuming the DP being removed as a possibility as part of his plea -- apologies, haven't read all the details yet).
So I personally am not able to be happy about this, because it's too little too late, IMO, and smacks of his ongoing manipulation and gaming the system for as long as he can until he can't.
Just MOO
ETA #1:
I'm extremely cynical about his motives if he's hoping this plea is seen as him providing a scintilla of what looks like justice for the victims and their families and community he has attempted to destroy IMO, and I wouldn't be surprised if down the line he throws in the towel and says he was just bluffing, he gave a false plea because he was pressured so heavily and had run out of options for precluding getting the DP.
So I hope there are some airtight clauses in the plea agreement that he can never take this back, and then I might see my way to being happy he has FINALLY admitted to what he did, the depravity of it is still just mind-numbingly awful, IMO.
ETA #2:
BK's always had this in his back pocket, IMO, and saw the writing on the wall, went as far as he could trying to see if he could get away with their murders before crying uncle and ducking the DP, cuz he never planned to die for what he did to the four of them who died. Despicable doesn't even cover it, IMO.