Но там сделан существенный акцент на том, что всё объясняется с точки зрения физики

Sakurajima-senpai, the celebrity who started school midway through the first year,
is totally an outsider.
Once the class takes its shape, it doesn't change easily.
Others will talk behind your back if you stand out, calling you annoying or a show off.
And once that happens, everyone knows that there's no going back.
That's the kind of pace a school is...
Nobody can approach Sakurajima-senpai to talk to her.
They don't want to stand out, to be isolated...
That's why Sakurajima-senpai is also reading the situation,
and pretending to act accordingly.
I'm sure.

A rumor is kind of like the atmosphere, isn't it?
Since lately, the atmosphere is something you need to read.
That "atmosphere" that labels you as a bad person if you can't read it.
And the people creating that atmosphere don't have a sense of participation,
so it's foolish to try and fight against the atmosphere.
So you're leaving misunderstandings be, and giving up before even fighting.