There's a simple answer for this

I don't see the ACLU setting up its own charities to take care of these people. Their only intent is to force Christians to give up their civil liberties. If the Church closes the charity, will the ACLU fill the gap? Not bloody likely.

There are atheists I respect, and I mean nothing derogatory about them here, but honestly, when was the last time you saw an explicitly atheist soup kitchen, or a Madelyn Murray O'Hair Memorial Hospice? The mandate to care for those in need is a religious one, and atheism does not in itself have anything analogous. Oh, kind and generous people can also be atheists, but I've never heard of anybody doing unto the least of these because of his atheism.

So, human toothaches at the ACLU, if you're serious about guaranteeing these people their "right" to kill, either take care of them yourselves or shut your frimpin' pieholes.