You sound like you've been very impacted by an ordeal - but bullies are often not quite as simple as they just enjoy others pain. When you'reach talking about "kids" in general the description becomes very worrying. They're not a collective group that all think the same, nor do they only have one objective which is to look for weakness and exploit it! Obviously there are some children who are bullies, but kids as a whole don't naturally exhibit that sort of behaviour.
My view on this was that all those kids who saw me being hit, hurt, shouted at, including the time a girl who kept my head under the water on a visit to the seaside while the teacher was busy elsewhere; they did f* all about it. Just stood there and did nothing. To me, they are just as bad as the bullies.
Regardless - onto the point of the thread - if there is a child who does exhibit that sort of behaviour, there is no way a school environment can remove possible weaknesses to exploit. Even if somehow a school could, how would children with these bullying tendencies behave outside of school, where these restrictions are not applied?
A school can have a strong anti bullying culture and philosophy. It would never eradicate it but it would help.
I hope you got your cup of tea 