You can put your fears to rest! No one on earth, during your lifetime, is going to start a nuclear war. All the bluster is political posturing and intimidation which is most effective on the low information people.
The intelligent people will keep themselves alive and the lamebrains will come along for free!
Terrorists may use nuclear contamination but nothing that can be traced to a Government anywhere. Israel alone, with the arsenal they have today could kill a hundred million Arabs/Persians. No, the danger to Israel is not from big threats.
Their greatest danger is being absorbed by the population growth of their minorities (in their case, Palestinians,) while we, likewise, are losing to our own immigrant minority.