Because no matter how small you make the nuke, or how big you make the conventional bomb, it’s still a nuke vs a non-nuke. The nuke is always going to be perceived to be worse, and a “weapon of mass destruction”. It’s like how there’s no such thing as a “little bit” of chemical or biological warfare; **any** amount of it is (generally) condemned. And the use of any WMD is very, very likely to lead to escalation.
There’s some theorizing that if the USSR had invaded western Europe during the Cold War, NATO would almost certainly have had to use tactical nukes to slow the advance of the Red Army, at which point a conflict that started as a conventional one would rapidly turn into a full-on nuclear exchange.
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