Bollocks.
That sentiment is correct in the sense that, if we're going to have a pointless war, we might aswell make sure that as few people die as possible by devoting as much money as we can to said pointless war. But when sending more of our kids in is tantamount to throwing them away all for the sake of not losing face, you can jog on. Ask a family member of a fallen soldier whether they'd rather more kids die so that their son didn't 'die in vain' (which makes no sense anyway), or whether they'd rather we made sure that it never happened to anyone elses family again. Expect the second option a thousand times out of a thousand.