What afterlife issue in Judaism? They get arrested in Israel or elsewhere, rejected by the Jewish community, & convert to Islam .... but not any old kind, the radical kind where they can feel right at home.
Then they rant about Jews killing innocent civilians, when it's they themselves who hole up under civilian homes & businesses of their beloved brothers & fire at their "declared enemies"... so civilians will get killed more easily & make a nice PR print to recruit more.
Then in their interpretation, they gain martyerdom & a guarenteed place in the world to come by having fought in defense of Islam, meaning having fought to make every land that was ever Islamic, Muslim again no matter who's hurt in the process. (This is the literal interpretation of jihad & the one they use.)
(I'm serious about the arrested. There are only a very tiny number of Israel supports in the world who have considered targeting randomly at civlians. Israel has outlawed both the behavior & any associated groups. And when a member walks onto Israeli soil they are immediately arrested, without having had to do any damage - just for considering it. Even less of these are in Israel, than elsewhere in the world.)