"What's the difference between migrants paying for everything and our kids paying for everything? I'm not being pedantic. I genuinely don't understand why there seems to be general agreement when someone brings up the "We need to have kids to fund us" line"
I don't see it (migrants "paying for everything") ever happening, but to take this argument to its logical conclusion, suppose for a minute that our country has a huge influx of immigrants over the next 15 years, sufficient to bring about a situation where they constitute a majority of the tax take. With this tax majority would obviously come a numerical and ultimately a political majority, and a political unwillingness to spend their money on supporting the greying (mostly non-immigrant) population. Certainly, if Ireland were to see demographic changes on this scale, I think the point would be largely academic, but as it is clearly not going to happen, I don't think there is much to be gained from debating the issue.