In my experience, these numbers seem very low. Ive never cheated but I've been cheated on in nearly every relationship ive been in and many of my friends have as well or have been the cheater. I'd believe these numbers as the percentage caught cheating. If it was self reported, which is probably the only way to collect that data, I'd assume some people lied.

There's a difference when violence results from instinct and/or having no other choice, and actively choosing violence. But this distinction is even more damning, as we see many smarter animals become capable of cruelty/spite/malice. Like that tiger who stalked and killed a man in revenge, or dolphins/orcas inventing elaborate methods of toying with their prey, or chimps being outright genocidal psychos.

I'll add to this an anecdote. My neighborhood is near a nature preserve. We get all kinds of animals theough here, but mostly racoon, possums and armadillo. Oh and feral cats. For a while we would occasionally have critters fighting in our yard. You'd hear it at night especially during summer. Not so much lately.

See a few years ago we got a feral kitten fixed as part of our local colony management group. Cat decided to stay, and we've been looking after her. Friendly, but stand-offish. We make sure shes fed, but let her do her own thing. Hasn't shown much interest in the inside.

We noticed that in the evenings raccoons would show up to steal her food. We chased em away, but theyd just come back later. The thing was that cat would sit there and watch the raccoons. She even moved out of the way once she was done, and let the raccoons have their share. Its been a few years now, and our yard cat manages things between other cats, the raccoons and the possums, and sometimes armadillos and nobody fights about it. Heck sometimes we find a small crowd waiting for our cat to summon the food for them.

The point being, violence may be an inherent part of nature, and the wilderness. However even animals when they dont have to work so hard to survive will cooperate when its to everyone's advantage. Which means that anyone who tells you that violence is the only law of nature is full of shit, and is really just telling on themselves. In my opinion.

you could probably successfully argue that even herbivores are inflicting violence on plants because they’re destroying and consuming an organism.

Don't need to stretch that far.

Lots of herbivores use violence, either in defense against predators or in competition with their own species for territory, resources, or mates. I'd even go as far as to say that the majority of them do, at least for the first of those two purposes -- it's rare to find an herbivore so passive that it wouldn't use 'violence' to protect itself against a predator attack if necessary.

Also, the vast majority of people in this time period did not live in caves. It's just that caves are much better at preserving traces, so much of the evidence for these early peoples that still exists is found in caves.

To think that they were 'cave men' and mostly lived in caves is like, well, seeing dinosaur footprints preserved in mud and therefore thinking that dinosaurs spent most of their time stomping around in mud.