The idea that people can't be forced to arbitrary behaviour is not the same as the idea that people's minds are rigid. Also modern war is not what it used to. You need huge organization, funds and convincing people to risk their lives.
Except maybe in the USA, that patriotic feeling is no longer prevalent in first world countries. And that with professional armies. What happened last time you had forced draft? Was it Vietnam?
You'd need a huge amount of money for propaganda that would fire back anyway. A sensible percentage of population sees the (usually economic) interests through the justifications.
An existential threat would hcange that in short order. Terrorism involving the destruction of planes, trains, or individual buildings makes people angry and afraid, but if an actual state were to launch a conventional war I think you'd have no problem re-instituting a draft even in democracies. Of course in many countries a sufficiently serious attack would raise the prospect of nuclear retaliation; a nuclear capability is an economic substitute for conscription.
Except maybe in the USA, that patriotic feeling is no longer prevalent in first world countries. And that with professional armies. What happened last time you had forced draft? Was it Vietnam?
You'd need a huge amount of money for propaganda that would fire back anyway. A sensible percentage of population sees the (usually economic) interests through the justifications.