There's been much discussion about whom LE determined was the aggressor in the reported Moab altercation between Gabby and BL.
I don't recall consideration of the severity of the alleged aggression by either of them towards the other, nor what that may indicate.
BL grabbed Gabby's face, reportedly leaving a scratch from his nail. Gabby demonstrated this to LE.
IMO, this action by BL is a far more vicious than any slap.
Animals slap away their young when bothered by them, but to dig their claws into the face is an actual attack, an attempt to control the body of the creature, and to cause harm.
Grab your own jaw, with thump and middle finger just anterior to the bony parts, where the soft tissue of the cheek pads begin. Push not very hard at all, directing pressure towards the joints.
You'll likely experience significant pain which is sustained over some time – even causing a subsequent headache.
There is a very skinny opening in my thoughts to allow for BL to be innocent of causing Gabby's death, in spite of his behaviour.
However, IMO, face-grabbing is a savage act, indicative of a sadistic mind.
I'm not sure I agree. For example, not that I recommend a parent do either, but compare grabbing a child's face by the lower jaw (as some parents do) and saying "Look at me" to slapping that child's face (as some parents also do)...No, the first is not more vicious. (And yes, I realize BL isn't GP's parent but you talked about how parents treat their young. And no, I'm not saying what BL reportedly did was ok.)
I don't think we fully know the DV pattern, if one existed, between GP and BL. GP's family and CL have said they didn't see anything alarming. But Rose did speak. She reported BL once took GP's ID so she couldn't go to a bar with Rose to go dancing. Rose said GP was very upset.
According to this source Gabby Petito's best friend claims Brian Laundrie was jealous and controlling | Daily Mail Online
"Gabby returned home and confronted her boyfriend, who Rose said admitted he took her license."
'Brian didn't want her to go out with me, so he took it,' she recalled. 'She was so hysterical. She told me she slapped him and said something about him pushing her."
So I think the historical pattern of hostile physical interactions is unclear. Statistics tell us what is common but they can't be used to predict individual behavior.
JMO