Make no mistake.
First of all, the fact that they're all just shits 'n' giggles over the holocaust of 53,000,000 abortions in this country over the past 40 years is in itself enough to obliterate any credence at all they may claim in "doing it for the children".
Secondly, if they're so sick and tired of people "claiming their freedom to be more important than human lives" as we've seen them repeat ad nauseum today in reponse to this tragedy, then why are they so against things like DUI checkpoints, TSA searches, surveillance drones, or for that matter, forceful interrogation of terrorists? Those things are much less intrusive upon basic American rights than confiscation of the means for individuals to defend themselves, and they unquestionably hold the potential for saving lives. Why not a police checkpoint at every interstate on-ramp and many surface streets, given the number of children that die as a result of accidents? Yet to suggest such a thing at DU would bring the howling mob down upon you in short order.
No, their agenda has nothing do to with being "for the children", whom you rarely hear about in that shithole unless it's a complaint about the Duggars having too many or a Palin having one out of wedlock or overpopulation or their crying on airplanes and in restaurants, and let's not forget the charming little term "crotch-droppings" coined by none other than the loving, tender hearts of The Hive.
Their agenda is the same as all good Leftists throughout history seeking to pave the way for their depradations - they know that an armed populace will never accept the full-blown Socialism their black, soulless little hearts so crave. So, that populace must be disarmed, and they don't care how low they have to stoop into hypocrisy and arguments from emotion, that they otherwise claim to despise, in order to do it.