It's OK if they choose to seek other avenues for dealing with that problem. The easiest solution is often not the best, and sometimes there is no net-positive path forward.
Though I would debate the idea that immigration is an "easy" solution. Perhaps the way it's frequently being done, with a lack of social integration, etc. But that's just bad policy.
Your claim that it’s just a demographic shift is like the argument for the founding of the US. It was just a demographic shift. You might have your opinions guided by colonialism and capitalism more than you think.
> Your claim that it’s just a demographic shift is like the argument for the founding of the US.