This, this is one of the BIG reasons why Japanese authors are so annoying and a pain in the ass to deal with. They will create god-level characters, just to have them be reclusive losers, be as dense as the gravity from a neutron star, have this retarded thought process that they need to be as inconspicuous as possible, or just pussies.
In this case, he is 100% okay with letting other people be harmed, JUST so he doesn't do something that causes people to look at him in a public light. Yet, all this idiot needs to do is flick a friggin eraser at this guys hands and feet and break them. Who the hell would be looking at the mc flicking something from his fingers that would be borderline supersonic while a guy with a gun is about to rape a girl.
Hell, let's not forget about the fact he even has an ability that, while it may not completely erase others memories, it would absolutely be enough to make them not remember it clearly. So he could easily do something hidden in the crowd and NO ONE would ever know.
I'm not even mad that it is attempted rape, all of us here know it would never actually happen. It's the ridiculous circumstances this bullshit author tried to create for no other reason than to create a bogus dramatic situation AND on top of that, have an mc not want to easily solve the situation because he is AFRAID of being noticed.
It's like having a maxed out character from the beginning of the game and still running away when you see an enemy.
Edit: Even though other people have pointed it out, he may yet do something, but it's still ridiculous. I absolutely agree, that because of the partial chapters, this does create unnecessary drama because he probably WILL do something and we just haven't seen it yet. It's the notion that he didn't even THINK of doing something because he didn't want to be noticed is one of the biggest reasons why so many people have an absurdly low opinion of this character, and it's justified. There is no legitimate reason to not do so