I think it would depend on motivation.  If they hate Israel because Israel is Jewish, there is a good chance they hate Muslims as well, so they wouldn't mind a whole lot of deaths.  This would be if the folks are your general alt-right folks.  However if they are just anti-Israel, then it would seem that it wasn't well thought through.

Of course, like with most things like this, they are probably just ignorant fools who will likely be caught and have to do some sort of community service.