I generally reframe it from a perspective even they think they understand: Money.

Governments want their money. Less Population = Less Taxes for them to take, ergo, no government is trying to lower their population. And do they, the audience, think that the government is willing to have less money?

I don’t think so!

The people who made fun of you won’t be laughing when they share 50% of the blame during the damage claim phase of an accident.