Is there any crime you could commit in the US that is do bad it would result in loss of citizenship?
No other country would behave this way, but I guess we should expect that from one of only two countries that taxes all it citizens worldwide, even if they've never even visited the US.
Given that US citizenship is difficult and ludicrously expensive to get rid of(presumably as some kind of punishment for wanting to do so) possibly some of these people might actually be happy about if they are dual citizens.