"In a fight for your continued existance, you don't abstractly ponder the implications that using a tool to save your life might allegedly set a precidence for some criminal to abuse a similar tool against someone else."
Sure you do. Israel's existence was directly threatened this past summer by the animals who seek to destroy it. Instead of inflicting collateral damage to make a point that Israel's enemies have nowhere to hide, Israel chose to fight a war based on negative CNN coverage.
You really think with Iran having a nuke Israel would launch a preemptive strike? If that is the case, they would have done it before Iran could set in motion a defensive strategy to prevent an Israel strike.
Iran with a nuke only guarantees one thing, that Israel will be forced to fight a conventional war against Syria and the Hezzies with Iranian and European support.
A preemptive nuke strike opens up the idea of a nuclear exchange in regional conflicts.
Last summer's Israel-Hezbollah conflict could be fought over time and on CNN. However bad it turned out, Israel still viably exists.
Iran's leader has made it abundantly clear that he's building a nuke to erase Israel from the map. Should that happen, Israel won't viably exist.
It's the difference between the neighbor's kid bullying your kid, vs. the neighbor publicly promising to kill you and is now setting up rifle & bipod with a clear view into your bedroom window.
...that there will be a bright flash near Tel Aviv shortly thereafter.