A conservative is loyal to CONSERVATIVE PRINCIPLES. Such principles transcend the governments of ANY COUNTRY ( and the United States government is NOT exempt ).
One essential principle is this — Your property, lawfully acquired through talent and hard work, belongs to you regardless of whether you are a foreigner, a resident or citizen.
When government becomes CONFISCATORY, I see no reason why someone should not follow what the founding fathers did by peacefully renouncing their ties with their government, if and when they see that it is becoming more and more totalitarian.
Now, you can argue that the better course is for a conservative to FIGHT the government AS AN AMERICAN ( that would be my personal preference ). But I certainly would not call these people who leave, scum.
And I certainly would not support a confiscatory government BECOMING MORE CONFISCATORY by creating ex post facto laws targeting former citizens trying to protect their lawfully acquired wealth. That would be supporting BIGGER and MORE FAR REACHING and eventually MORE TOTALITARIAN government.
THAT would NOT be conservative by any stretch of the imagination.
A Conservative government would create and environment that ENCOURAGES wealth creators to STAY, not COERCIVE laws that create BIGGER GOVERNMENT like the Ex-Patriot Act.
Hey, you are trying to sell me on renouncing your citizenship as patriotic, then do it yourself, personally, I’m still an American.