Ahmadinejad and the Law Of Return

Pursuant to probably specious rumors of Ahmadinejad's Jewish roots... would Israel be obliged to offer him citizenship under the Law of Return? Well, no, since a Jew can be excluded from Israeli citizenship under the Law of Return if he or she is considered to be dangerous to the welfare of the State of Israel (a dubious distinction earned by Meyer Lansky among others). Of course it is often joked that Palestinians could accomplish their goal of a "right of return" simply by mass halachic conversion to Judaism.