This troper got a very creepy vibe when we see Inami's father telling her that men would attack and devour her. What sort of Father doesn't want his daughter to wed and tries to scare her away from other men? This troper gets a very Squicky incest vibe from the guy, and it's only dumb luck that he's the first victim of the very fear he tried to elicit.
He was likely just being an Overprotective Dad and took it to an extreme. Which then also meant he was Hoist by His Own Petard, as he was her first victim of being punched for being a guy. Souta even berates him for brainwashing her into this, and has to spend a lot of time with her to deprogram her from automatically hitting every man she sees.
Since Inami will punch every male on sight wouldn't that cause a ton of male to also get punched during work, and on her way to work?
It's been mentioned that she often take roundabout to get to work and get information about road that has less male walking specifically so she won't punch them.
Face it, if this wasn't a comedy Inami would have been in jail long ago. All she needs to do is to suddenly turn the corner and see one of her male teachers or perhaps her principal for example.