That's because faculty tend to be as willfully blind as they are cowardly and generally corrupt.
Which is what led to how I ended the bullying being done to me in school. Violence, contempt, and a total refusal to cooperate unless my parents we present. And when the principal refused? Walked out, daring the sniveling coward lay hands one me, then walked home and notified my father. Little shits that we're the faculty learned real quick the extent of their power when their previous chosen weren't able to shape a narrative.
The result is that you get suspended, and when you come back, you find you have be given various restrictions and loss of privileges.
Most of them you don't care about because you don't attend extra-curricular activities, but they prevent you from randomly picking study halls at random and restrict where you can go during lunch instead of being able to go wherever you want, making it easy for the bullies to predict where to find you and do something.
Naturally the staff are still blind when the bullies do approach you and pull something until you retaliate.
Also they threaten to expel you and send you to the "alternative" high school with all the B.D. students. If you have any hopes of going to college being expelled for "bad behavior" would probably put the kibosh on that. Especially if you can't afford college and need a scholarship.
Also the schools I attended had no qualms about restraining you if you try to leave without permission. Due to being "restrained" rather painfully and nearly suffocating from being face down on the floor with somebody shoving their knee in the small of my back as a 2nd and 3rd grader, I
HATE being restrained and made helpless and tend to react rather violently to attempts to do so. Which only got me into more trouble.
Never mind that I was trying to "walk away from the person antagonizing you" like they had just got done preaching, and they were the ones to grab me, you never do anything to a staff member when they are physically disciplining you. "You should have just done as you were told, then it wouldn't be necessary".
According to the police, and not just the police counselor, as they are the adults acting "in loco parentis", they are fully in their rights to do that and I'm in the wrong to resist, just like resisting a cop is wrong.
So daring them to lay a hand on you would get your bluff called, and you'd just get in trouble if you did try to do anything physically in response to them grabbing you to stop you.
Sorry, I had trouble with four and a half bad faculty members (the half was an enabler who never did anything directly, but was the principal and refused to believe me "you're exaggerating, I refuse to believe they would be that unprofessional/painful/ever do that" and just supported the bad staff members in whatever they wanted) in 2nd & 3rd grade, then I was bulled by peers in 8th grade and on to high school.
I changed schools after 3rd grade, then again from 7th to 8th. 8th to high was another change, and high school was actually better than 8th grade because the bullies would get punished as well for fighting, even if I got punished worse after the first time or two because "you have been in multiple violent incidents with multiple people. Why is it always you they pick on? 'Obviously' you must be doing something to antagonize them. You need to learn to de-escalate the situation and stop getting involved in these violent incidents. Figure out what you're doing to antagonize them and stop doing it. Learn some peer relations skills."
*rage detected*
Also my experience is not unique. I found this some years back:
https://web.archive.org/web/2018092...m/what-happens-when-bully-victims-fight-back/
TL;DR?
If you try to walk out and dare them to try to stop you, they will and the police will side with them if all they do is physically stop you. Heck, if you do anything in response to them laying hands on you YOU get charged with the crime.
Resistance just gets you more punishment.
School officials have the authority of parents for physical discipline, and to a lessor extent police. You are their responsibility, and they have the power to enforce their authority.