The issue is dual citizen males registering for the Thai draft at age 18, which is mandatory. They can be prosecuted and jailed if they don't register.
This is where the thinking/comments may come from regarding that a dual Thai/? citizen has to declare intentions by age 18.
When you register for the draft, unless you pay big money to get out of it, you at some point have to do the red/black ball selection lottery routine, and if getting a red ball (I think) you are in for 2 years.
As we know, when you enter a country's military, you have to take an oath 'to protect and defend from all enemies both foreign and domestic...' That could be the key to it all as once you take that oath you would have to possibly defend against your other country of citizenship.
This may also be the reason that we see more dual citizen Thai women than men. They don't have the issue of the draft and apparently can go happily through life with two passports and two countries of citizenship.
Any of us with dual citizen sons here should investigate all of this more before they grow up. Pete
