That's the major difference. Israel may have them, in the same way that the USA, China, Russia and France have missles and nuclear weapons - but have they declared an intention to use them without cause? I don't think so. Take a look at Hizbollah's web site or the official media of the Syria.
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One killed, three wounded in stabbing at asylum center in Sweden (AP)
from the article: 'Syria helped Hezbollah amass some 40,000 missiles'