Are you sure the people passing it out were right-wing Jews and not “Messianic Jews?” Because the latter are often people who were raised as Christians, found out they had a Jewish grandmother, then became a Messianic Jew to feel closer to her.
There are also plenty of people who are third-generation Messianic Jew or whatever.
Sure, there are people who are ethnically Jewish and grew up steeped in Jewish culture and religion but one day converted to Christianity, but they aren’t the majority of the “Jews for Jesus” crowd.