Hella long post warning

First going to say what I think needs to happen
Both families speak to CW, in person, letter, etc. and tell him he needs to tell the truth. He will release all to move through their grief if they know. Only he knows. He, especially those who already love him, find that some will in time come to forgive him, no matter what he did. The first step is the truth.
Second: defense: you must know that his nonsense is not at all 'reasonable' story makes him out to be more of a monster than most people already thought!!
OK....so, I'm going to post what I find to be a plausible scenario.... CW says he had to kill SW because she killed their children.
A little bit of truth except backwards: he HAD to kill SW because HE killed their children.
First: I think it's possible deleting FB account was because his AP was threatening to 'out' the relationship....because he was stalling.
(total speculation, if not PC here, delete)
We know however that he had upwards to 5-6 weeks of bachelorhood...we KNOW he had acquired a mistress
So.....SW back in town couple of days.....goes off on Thrive mission....a 3 year old and a 4 year old, after weeks of no 'dad' duties....on his hands alone...with all the stress already going on.......
& add to this he is supposed to take them to some birthday party! Imagine that, figure SW probably had that duty & dads were scarce figuring they found more important things to do on a Sunday...so there he is toddler hell & moms & etc. (btw: using his pov for this, not saying i agree with speculation on how he saw things...)
then back home alone with two toddlers ramped up on all the drama & excitement not to mention sugar highs......
so......(this is TOTAL speculation.....)...this scenario is to, well to normal people 'explain' things (it never will)..so, point being: where in house, if an adult loses their temper is fatal damage likely to be done: bathroom...all that tile, porclein hard surfaces.....
so...he's drawn the bath...one daughter in...the other resisting...doesn't want to, they've been peevish and bratty and whiny and ramped up and wanted all those presents etc. (totally speculating in cw pov, - not advocating it at all, okay?)...anyway...he pushes her to get in the bath...she falls....she's unconscious underwater, blood is spreading....other daughter screeching her head off.....he.....just 'snaps'.....i dont want to go more into detail
And maybe it wasn't in the bath - for his 'benefit' simply most reasonble place for an accidental death to my mind
He could have snapped at any point......
then.....given his own obvious to us now mental/emotional issues and stresses - he kills SW, and wants to just move on. That's why it's all got to 'stop' to his mind....he just wants to move on now....