>>508248013Having more old people than young stresses their welfare system, if they have one. Also, life becomes harder for everybody if there is less people making stuff and providing services. Think of the last sandwich you had, think of the hours that went into planting wheat, turning that into flour, rising chickens, taking the eggs, milking cattle, then shipping those to someone who then turned it into bread, then all the work involved in making the filling; it would take you years to DIY everything, but since there are a lot of people alive, other people can do it, and you just have to trade a bit of your time for it.
But the main reason why politicians are pushing mass immigration aren’t those listed above, so do not listen to them.