"Some people believe the solution to population decline is to encourage women to have more babies." Well, that's framing population decline as a problem in itself. Why is it a problem? Less people fighting over a finite amount of resources isn't a problem, but rather should be a benign goal. 

"And if you think about it, trying to bribe a woman to have a third child in the national interest is offensive."
But importing humans to in an effort to displace the current population, and make it more difficult to have children in the first place, is not offensive? I think it. Justin Trudeau caused great offence to some people by increasing the immigration target when Alberta's economy was contracting in 2016. It put excessive strain on Metro Vancouver and the GTA's housing market, that caused huge amount of outcry that forced provincial and municipal governments to react. Maxime Bernier just wants to lower the immigration target back to Mulroney, Chretien, Martin and Harper's 250,000.