And there are plenty of little guys who are jerks.
Men don’t attack women because they are bigger, they attack women because they are men. Now by that, I don’t mean that all men attack women, because obviously, they don’t, but enough people have pointed out that testosterone drives a lot of attacks against women, regardless of the size of the attacker.
Look at it this way: dogs attack strangers pretty much according to their personality and upbringing, not their size. Chihuahuas are some of the most attack-happy little putzes I’ve ever seen, because people don’t bother to train them not to, and most big dogs would get put down if they were as aggressive as half the Chihuahuas I’ve known. Some of the least aggressive dogs out there are giant dogs, like Giant Schnauzers, mainly because they’ve been bred for things like herding. Great Danes are big babies. In fact, IMO, the bigger the dog, the gentler it is, although I think that mainly has to do with the fact that when people know their little puppy with weigh 100lbs some day, they put a LOT of effort into non-aggressive training. But nevermind. The point is, the odds of actual success in taking down whatever the dog is attacking seems to have little influence over whether or not the dog decides to attack.
I think that’s true with men as well, except that men who can’t depend on bare-handed brutalization bring a knife or a gun. And that’ll still be the case after we scale up women.
FWIW, making women more muscular means increasing ligaments and tendons, and making bones harder, and might have the unintended effect of making childbirth more difficult, something animals that don’t walk upright don’t face.
Humans have difficult births, because we have pelves made for upright walking, which is the exact wrong kind for giving birth, and on top of that, we have the big heads. Women produce a hormone late in pregnancy that loosens up joints, and gets the pelvis ready to open up. All of that might get a lot more complicated. Pregnant women might be more prone to sprains and ligature tears, falls, and other problems, and it might take more of the hormone, and more women might fail to deliver vaginally, leading to more c-sections. This is pure speculation, but there are always unintended consequences. No matter how we try to think of everything, there’s always something we miss.