Nope. Fallout kills 15% of the non-fatal casualties. Still way less than the 30,000 murdered by the regime.Yeah, you're way off the reality.
First it doesn't just kill people on the site, it kicks up irradiated debris (fallout) that the wind carries across borders.
NUKEMAP by Alex Wellerstein
NUKEMAP is a website for visualizing the effects of nuclear detonations.

Long-term it will stop lunatic regimes attempting to do the same as Iran.Europe ain't coming, and dropping a nuke in this case ain't about just casualties it will cause, its about the symbolic meaning it give, the short and long term social,political, geopolitical costs that U.S.,Republicans,trump, Israel will have to face. And the long term negative social,political and Economical,geopolitical effect it will cause for the U.S. as a whole.
Don't see it that way, different circumstances, different geographies. The nuke was used because a lunatic regime was rushing towards a nuclear bomb, not because of any other disagreement, and it was used only on sites associated with that nuclear proliferation and only because there was no other way of taking them out except a nuclear weapon.Not just that,It will set a precedent, like in future Russia's chances of using a tactical nuke on Ukraine will increase manifold, if u.s. nukes Iran.
And many other nations will rush to get their nukes if a precedent is set of use of nuclear weapons in modern day again a non nuclear capable nation Poland, Japan, s.k., maybe even Germany will think of getting sovereign nukes, Turkey etc.
WHO officials admit they are preparing for possible nuclear weapon use in Iran
World Health Organization staff remain ‘vigiliant’ in the event of a nuclear incident




