Folks in Tuvalu are going to lose the entirety of their geographical boundary to the sea.
I don't see why people should be kicked out of a country because they were born in another country. The whole concept of "illegal immigrant" just seems so ... medieval. Someone isn't allowed to live and work in a land because they were born across an imaginary line in the sand?
I don't get it
One good way to "get it" is to go try stay in their country, without following their due process to become a citizen, and see what happens.
A similar good way, is to go live in different countries for a while (try Syria too), and see what ideas some people have about running their countries, and consider whether you'd like people with such ideas to be a sizable minority or even majority in your country.
You did not do anything to get that. But your parents, their parents and those who came before them did, with the intention that you would.