The people who were condemning the party hostess would've left her alone if they had known that Sam wasn't perfectly happy for all of those 7 years? I don't see the connection at all.
I do. If it was known (perhaps we should say not falsely denied) that there was recent arguing between the couple (per grandmother), longstanding control, jealousy, child care, and custody issues, problems completing high school, and fewer than 10 consecutive weeks co-habitation prior to the murder, plus assault with a weapon, theft, and criminal conviction where Nick blamed Samantha for the criminal activity, I would have focused on Nick from the beginning. I think most people would not have given the 'crying' father of an infant and 3 year old daughter a pass, where they instead looked at the bigger picture of murders in the area.
As it was, the suspect who led police to the body parts was given a pass, and the people that hosted the party were berated on social media for allowing the young mother to be plucked off the streets in the middle of the night. The people that gave the party did absolutely nothing wrong, and there's nothing they could have done differently that would have prevented Samantha from being murdered after she arrived home that night. Anyone that gave the party host a hard time for Samantha's decision to walk home should apologize to the party host. Samantha was not plucked off the streets by a random murderer. She arrived home, and was the victim of the very common spousal homicide.