Folks at that age tend to think they're invulnerable. Israelis perhaps more so as so many have known combat and terror and survived. And certainly some think the government is simply crying "wolf".
When I was in my 20s I traveled on my own from Israel to Turkey and Iran. Granted the Shah was still in charge and I stayed a few days with a Jewish family in Teheran before heading off to Esfahan and Shiraz. It's the sort of thing many do when they're young.