While I understand your point of view based on this one observation, I think this is a terrible idea if you look at the big picture.
Whether they get bullied or not, high school is an extremely important time for kids to gain social skills and learn how to deal with people. Dealing with people is one of the most important skills you can have, period. And that often means dealing with people that are being dicks, and people who you like and are good friends. And if people are being dicks, which they inevitably will be, it's a good time for you to think about it, build your self confidence, and figure out who you are.
I understand that sheltering them from the real world is not your motivation for this opinion, but it is the reality of what will happen. Your kids will miss out on a huge period of personal growth and a large expansion of their experience dealing with other people which they will never be able to get back later.
Whether they get bullied or not, high school is an extremely important time for kids to gain social skills and learn how to deal with people. Dealing with people is one of the most important skills you can have, period. And that often means dealing with people that are being dicks, and people who you like and are good friends. And if people are being dicks, which they inevitably will be, it's a good time for you to think about it, build your self confidence, and figure out who you are.
I understand that sheltering them from the real world is not your motivation for this opinion, but it is the reality of what will happen. Your kids will miss out on a huge period of personal growth and a large expansion of their experience dealing with other people which they will never be able to get back later.