Ireland has a PPS number which everyone who’s ever had a job or claimed government benefits has. The union of those sets is basically everyone. Clearly that hasn’t helped.
I’m applying for a second citizenship. That means that I can have two national ids that are unlinked. In the US, you can petition to have your SSN number changed, as well, so that doesn’t work. If you are willing to commit crimes and lie, it isn’t that hard to spin up an entirely new identity. Some people are born to parents that don’t notify the government. The real world is incredibly messy.
If I were to be placed on a list with one passport/id, I could just use a different one.
The bigger issue is that the list is meant as a risk alert, but companies treat a match as truth because the penalty for doing business with a sanctioned entity is far higher than whatever they might lose by not hiring someone mistakenly.
What you need, at minimum, if you are going to make these lists is an easy way for false positive people to prove they aren’t the person named (tsa/homeland security have a “redress number” you can provide if you have the same name as someone on their list). Then a legal requirement that anyone checking this list must also ask for additional documentation if they are making a decision based on a hit.
I'm sorry what? A second citizenship to the same country?
I won’t have two unlinked national ids to the same country, I would have a national id in two countries.