LOL, you can't infer anything about a person's sex from size, without knowing the person's age.
A non-athletic boy can look just as clumsy hitting the car as a girl. You can't draw any conclusions from that.
As for throwing a baseball, sampling random males and females is not the correct group. You should sample non-athletes who've never thrown a baseball. Amongst that group, I'd bet you'd find lots of males are equally atrocious as females. Have you seen people throw out ceremonial pitches before? Not every boy plays Little League baseball anymore.
And while you want to argue that we shouldn't look for physical outliers, you conveniently ignore that statistics show that the vast majority of vandalism is done by males.
I know you've already stated the running stride is indeterminate, but I think you should look at it some more. It's a long stride, with a prominent heel strike. This person runs like a boy. And, I don't know why you think this person is 14 to 26yrs old. They'd have to be under the age of 18, more like 14 to 16yrs old. Do you really think this could be a flat-chested girl at 26? LOL!
Your argument is almost entirely exceptionalism. Sure, it could be a boy (notice how you switch between boy and man as convenient) but how many boys are dressing up in ninja outfits and hitting Tesla Model Ys with a hammer like this? This would presume the boy was driven there by someone else if they're below driving age but this is why I thought the perp was at least driving age.
Odds are that the perpetrator doesn't want to be found out (hence the outfit) and got to the location on their own. Also, even non-athletic boys would have a more male-typical hammer swing.
It's not just about little league but throwing anything. You'd still find a difference among a random, sufficiently large sample size between boys and girls when it comes to both throwing and hammering.
Males are more single-focused when it comes to tasks, so why would one hold a cell phone whilst vandalizing a vehicle? That's a female-typical behavior. Have you seen the size of female key chains compared to males? They also tend to carry a lot more stuff generally...phones, purse, water bottle where males seem to be a bit more minimalist in what they carry. This doesn't absolutely rule out a male but I'm going on the cues I see here combined with the rest of the data.
Ceremonial pitches are probably not the best way to assess differences among male/female throwing/hammering ability in the same age range. The very worst pitches have been females (Kourtney Kardashian being a shining example), but it's obvious that a random sampling of males vs. females in the same age group would show a difference in throwing ability due to self-selected activities as kids.
Yes, males commit more violent crime and more vandalism, but THIS perp (featured in the video) appears to be decidedly female. That's my take on it.
I don't see why a female couldn't run well, especially if she's young. It's not a sprint, and sprinters wouldn't be running on their heels. I don't think the run cycle is as compelling in either direction. Could be male or female.
Sure, it could be a flat-chested female. They do exist, especially if she's very petite. Or, it's a male who has no idea how to swing a hammer. Then again, these were quick strikes but I thought that it was very female typical to have the wrong foot forward (no torso whip) and to have the cell phone in left hand (which detracts from the activity). Also, why isn't the phone in a pocket? Most guys would stow the phone before doing something like this.
The reason I can judge size is because this type of criminal act is a little more sophisticated and planned, and the person got to the location somehow. Why would a kid want to hammer the vehicle owned by an adult in this obviously premeditated fashion? I suspect adult because adults commit more crimes like this, but adults have problems which might cause this kind of reaction; lover's quarrels, breakups, cheating, someone not paying child-support, etc.
This is why I think the minimum age is high school age, probably over 16. And, do you think some kid is going to ride a bicycle to the crime scene in full ninja outfit with hammer and cell phone, especially if they don't seem to be using a pocket to stow the phone? It's likelier that this is an adult committing this crime, thus it's a small adult and thus more likely female (especially given the form). If the area has a high incidence of Asian citizens then it's not unusual to find petite Asian females, far more likely than a male would be that small and committing vandalism as seen in the video.
Either way, that's just my assessment of it. I'm not sure where this is going to go as it seems we've been through all of the available data quite thoroughly. We may have to agree to disagree here.