I think all arguments and accusations of character assassination come from the fact that there is a certain dichotomy between the SW as she comes across on her videos, when she is alive, and horrendous, scary, tragic death of her and the kids.
I might admit - watching her videos, I was sometimes thinking, "good teaching material about how not to do family videos". SW comes across as sometimes naive, and sometimes there is too much of her. But I see nothing in them that might warrant such an assault.
OK, CW fell out of love with her and found another woman. But - all this drama is happening in XXI century, in CO, a liberal state. In CO, where divorce is not a problem, and contraception, if you feel trapped in a loveless marriage, is readily available. Likewise, discrimination on the basis of sexual orientation or preference won't fly. And, first consultation with the attorney might even be free.
So no matter what people say about SW, it does not minimize CW's guilt at all. He had options.