So you're saying - someone in the US is going to discover my ancestry and... do what? You can find far more inflammatory things about me online. Besides, if someone really wants to attack Jews, it would be a lot easier to find the address of their local synagogue. Or search the phone book for obvious last names.

There are a lot of lessons to learn from the 20th century, but I don't think "you have to hide your ancestry" is one of them.