This is hardly news, they've had nukes for years but they are only for defence. It's not like they go around using them, also many countries in the world have nukes so what difference does it make if Israel do or don't. http://www.bbc.co.uk/news/world-17511816 Now if someone had suggested Taiwan had nuclear weapons, now that might have been more interesting.
I wouldn't say the Israelis use them defensively. they use them as cover to attack other around them and prevent retaliation.
There's none, of course. The OP is just another under-educated kid that has been visiting some crank sites on the Web. <shrug>
Well Jimmy Carter said a few years ago they have over 200 warheads. He didn't appear to have gone senile.
Of course they do and 90% of the world know it. The thing is, people like the OP didn't know and stumbled on it coupled with a stupid conspiracy theory and bought into the whole thing. That's what silly, under-educated individuals do all the time.