Bullying shows up in group situations where there is no escape open to the victim, for example, prison and children in compulsory-attendance schools.
In adult life, people move, find a new job, file felony charges, or win millions in lawsuits.
Agreed. At that point, the "pecking order" is establishing itself. This is a natural occurrence.
Prisons are self inflicted and thus no sympathy is warranted for those interred there.
Schools are not prisons, and there are options open to the parents which you have listed already. People move.