411A & co, it has nothing to do with whose 'fault' it is as who has the kids but more to do with attracting employees. If the company needs to offer schooling, which many have in the past, to attract suitable candidates then that's what they'll offer. If they can get those same people without this expense then that's what they'll do also.
It's simple supply and demand. If you accept conditions offering x amount of schooling then it's pointless complaining about it later. Having those same conditions eroded after the fact is another matter.
411A, having said that there is a valid case for schooling assistance to expats as it generally not practical to send your kids to a local school and other schooling is often quite expensive so in the past employers have recognized this fact by offering to help with the expense in order to attract people. Your 'tough luck' comments smack more of an empolyer mind set.