In all areas of employment where an employee is deployed overseas for any length of time or is expected to move postings (forces, diplomatic, multi-nationals) and where the employer is keen to attract and retain very high quality staff, the offer of payment of boarding school fees will form part of the salary package.
It is recognised as an important factor in persuading people to move and the importance of children's education comes top of survey after survey of mobile employees. (Health care comes next, then accommodation). These parents are far from neglectful.
My family is not in the forces but I will be sorry if allowances for this are reduced for those families. I know from experience the choices that have to be made and how complex and individual they are. It is true, believe it or not, that children (at least older ones), would frequently prefer their parents to remain together as a secure unit rather than have one at home, near their school in the UK.
Those who think that a partner doing a dangerous or otherwise stressful job overseas without the support of their life partner can do it as well alone as if they are supported, have obviously never tried it. If children are being well educated in a pastorally strong school, they have one less thing to worry about.
Boarding schools and experiences of them vary and they are not right for every family. Those who have had to choose are well aware of this and far less dogmatic, but from some of these posts, you would think we are discussing Dickens' Dotheboys Hall.
Meanwhile, on other threads, People are bemoaning the fact that children who attend these kinds of schools are getting all the good jobs and running the country.