Guys,come on..u gotta have some common sense...any person with brains shud realize that international travel does require documentation including visas.
Maybe what India cud do is have better electronic copies in place so that atleast ppl who are PIO's or kids of former Indians can get in without hard copies ...and just on the basis of electronic records..
But you cannot blame the guards for that.they are doing their duty...while the immigration guys cud have shown sympathy for the kids...well...its a debatable issue. But they were just doing their duty and there is no way u can accuse them.