I agree! The GOP was hard right in 2004 and swept the Presidency, House and Senate.
There’s nothing “irresponsible” about having children—any more than there would be something irresponsible about maximizing profit or increasing crop yield. You are unwittingly repeating a group-think, far-left code of behaviour in advocating population control, and it cleary violates the “multiply and replenish” edicts of the Bible. As to the obvious choice — “converting them” — we all have a responsibility to talk up, with any immigrant group, the virtues of a free markets, the rule of law, and the value of private property. Don’t make the mistake of blaming our out of control statism on the immigrant groups who have been encouraged to take advantage of it by leftists demogogues.